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Glassheart is the upcoming third studio album by British recording artist Leona Lewis. The album is scheduled for release from 12 October 2012 by Syco Music and is Lewis's first release in partnership with RCA Records following a restructure at Sony Music Entertainment which led to the closure of J Records. Glassheart was conceived in 2010 shortly after Lewis completed her first headline tour, The Labyrinth. It was originally scheduled for release in November 2011 but was rescheduled several times throughout 2012 to accommodate further recording sessions and more creative time for the project.

On the album, Lewis is reunited with Ryan Tedder, producer of previous singles "Bleeding Love" and "Happy". Lewis also worked with new producers including Naughty Boy, Rodney "Darkchild" Jerkins and Dallas Austin amongst others. "Collide", a collaboration with house music DJ Avicii, was released on 2 September 2011 as the album's first single. It would go on to become a top-five hit in the UK and Lewis's first single to top the Billboard Hot Dance Club Songs chart in the US.

To bridge the gap between Lewis's last album Echo and Glassheart, Lewis teamed with Fraser T Smith to release Hurt: The EP. Following its positive reception, Smith was hired as Glassheart's executive producer, and has credits on many of the album's songs. Scottish singer-songwriter Emeli Sandé aided Lewis to write the second single "Trouble", a dark song inspired by Lewis' break-up with childhood sweetheart Lou Al-Chamaa. "Trouble" features US rapper Childish Gambino and was premiered on 21 August 2012, ahead of its digital release on 5 October 2012.

Background and development
Lewis began working on her third album Glassheart in late 2010, shortly after completing her first headline tour, The Labyrinth. Glassheart was due to be released in November 2011 after the release of the first single, "Collide" (with Avicii). However, in September 2011, Lewis posted a message on her official Facebook page writing that the album will no longer come out in 2011 as planned, explaining that she was "inspired" to continue making new music and therefore she is personally pushing back the album to early 2012 instead. That same month, it was announced that the album was expected to be released on 26 March 2012. In December 2011, Lewis released Hurt: The EP, a collection of cover songs to bridge the gap between Echo (2009) and Glassheart (2012). In January 2012, the album was pushed back again, this time to November 2012, following announcements that Lewis had worked on a track with Scottish DJ Calvin Harris and Fraser T Smith was producing for the album. In April 2012, in an interview at the Ariella Couture fashion show, Lewis stated: "I’m now planning to have the album out in the summer [of 2012]. Simon Cowell has heard some of the tracks and he loves it". Cowell would later publically off his support for Glassheart, declaring to Lewis that although there's been a lengthy wait of two years for new music, "I think this new album is sensational, you’ve never sounded better."

On 21 June 2012, Smith spoke to Music Week about Glassheart being released on 26 November 2012. Scrapping many of the earlier recorded material for the album (see recording sessions), Smith said he was "taking a production role for the whole album as well as co-authoring about half its tracks". Lewis would later talk of the album's push-back and Smith's involvement in the album, describing the original release dates as rough guides. "I had a provisional deadline but I was still in the midst of recording and didn’t feel like I’d got the crux of the album. So I kept going and kept writing and then I got Fraser T Smith involved, who went on to executive produce all the songs."

Following Lewis's performance at BBC Radio 1's Hackney Weekend, Smith revealed that the album was 80% complete, "We’ve got the key tracks and we’re very close." Describing the process as a stark contrast to previous albums Spirit and Echo, Smith said that when you work with many producers "you end up with maybe two or three radio songs and not necessarily the album sales you want." Lewis spoke to reporters back stage after the performance, revealing that the album had been brought forward a month to October 2012. By the time July had come around, Smith updated fans to say that the album was now 97% complete. At the end of August, Lewis began the process of closing the album by selecting the track listing and approving the final final audio mixes and masters of the songs. On 5 September 2012, Lewis used Twitter to communicate with Smith, and inform him that she was approaching the end of listening to all the final mixes. Lewis unveilled the final track listing for the standard edition on 9 September 2012 featuring twelve songs, but excluding the album's first single "Collide" (with Avicii). Smith confirmed that the final decisions had been made and that the album was 100% complete on 10 September 2012. A two-disc deluxe edition was also be released alongside the standard version as per a question and answer session Lewis did with fans. 30-second snippets of each song were released on 5 October, while the album itself was released in the United Kingdom on 15 October 2012.

Recording sessions
Amongst the first people to work with Lewis was her frequent collaborator Ryan Tedder who penned and produced multiple songs both on Spirit (2007) and Echo (2009). The album is named after "Glassheart," a song produced during recording sessions with Tedder in Denver, Colorado, when Lewis asked for a song that she could "dance and jump around [to]." The song was also co-written with Noel Zancanella and OneRepublic-guitarist Brent Kutzle. Kutzle, Zancanella and Tedder worked with Lewis on another other song called "Burn". A snippet of "Burn" was used during an interview with Clive Davis which aired on 23 October 2011. Davis who was the head of Lewis's US label J Records is now an executive of RCA Records has previously been involved in the A&R portion of Lewis's albums. The CBS interview titled Clive "The Music Man" Davis — Interview showed Davis talking about Lewis branching out with American producers, as well as him previewing various songs before going to a meeting where they would be presented to Lewis for her to chose to record. However when the track listing for the album was unveilled, "Burn" was omitted. Instead included was another song written by Zancanlla, Lewis and Tedder, along with Roland Orzabal and Curt Smith titled "Favourite Scar".

British hip-hop artist Tinie Tempah approached Lewis to record a duet with him called "Trouble," however after hearing the raw demo sung by Emeli Sandé Lewis decided she wanted to record the song for her own album. Together with Sandé and Fraser T Smith, Lewis recorded her the song. "Trouble" features on the album in two versions; the first features just Lewis and is the opening track on Glassheart, while the second version featuring a rap from American entertainer Childish Gambino features as track thirteen. As a result of recording "Trouble", Sandé and Lewis struck up a friendship which led to the duo writing several other songs for the album. "Mountains" was co-written by Lewis and Sandé with Shahid Khan, James Murray, Mustafa Omer and Luke Juby. The piano and strings-leg ballad was supposed to feature on Glassheart however for reasons unknown the song was reclaimed by Sandé and instead features on her own debut album Our Version of Events (2012). A small unfinished snippet of Lewis' version of "Mountains" leaked online on 15 August 2012 along with another song called "I Miss You Missing Me," which was written by Grammy-winning songwriter Diane Warren and originally sung by Chinese singer Bibi Zhou in 2010. A third Sandé and Lewis-penned song called "I to You" did make the album. In September 2011, Sylvia Patterson of The Guardian previewed several tracks from the album including "Sugar" and "Trouble," both of which feature on the album, in addition to the song "Blank Page." The latter was described as "a soaring reverie over mournful piano and strings," but it did not make the album. During this same time period, fellow American producer Brian Kennedy Seals revealed that Lewis would be recording one of his songs called "Open Up".

According to Yahoo! music, Lewis also worked with Ammo and Steve Robson while a press release from Sony Music revealed that Lewis had branched out to work with a variety of international producers. Amongst those Lewis worked with during the 2011 recording sessions were Swedish producer Jonas Quant (who is famed for working with Manchester Indie pop duo Hurts), American producer Chuck Harmony and American songwriters Claude Kelly and Al Shux. During this same time, two other American record producers linked themselves to Glassheart. Whilst working an a mentor on American Idol, American music producer Christopher "Tricky" Stewart he had been asked to submit material for Lewis's new album. French producer Sandy Vee and American songwriter Autumn Rowe presented Lewis with the album's first single "Collide". Digital Spy and Popjustice confirmed that Lewis spent time in the studios with American songwriter Rico Love, producer and writer Rodney "Darkchild" Jerkins", rapper will.i.am and Polow da Don. Lewis's sessions with Darkchild took place over the weekend of 18–19th May 2012, and produced the song "Shake You Up". Circle House Studios in Miami, Florida was the venue for the recording sessions with Love.

MTV revealed that R&B singer-songwriter Ne-Yo was planning to pen some material for Lewis to record. It would be the third time and Lewis and Ne-Yo had worked together, Ne-Yo having previous penned tracks for Spirt and produced tracks for Echo that did not make the final track listing. Ne-Yo wasn't the only past collaborator Lewis reunited with, Andrea Martin who co-wrote Lewis's 2008 single "Better in Time" had been working working for Lewis in the first half of 2011. On 1 January 2012 the leaking of a snippet of "Love Birds" (later renamed "Lovebird") revealed that according Idolator, Lewis had worked with Bonnie McKee who is known for working with Kesha, Britney Spears and Katy Perry. Lewis also travelled to Nashville Tennessee to record music for a week in January, and separately worked with Dallas Austin. McKee would join later studio sessions after Fraser T Smith was brought on board and co-write "Un Love Me" with Smith and Kelly Sheehan, a writer known for her work with Mariah Carey.

At the end of 2011, Lewis spoke about another of her collaborators – this time Scottish DJ Calvin Harris, "I've worked with Calvin on a song and want to do another – he's so talented. I'm planning an EP before the end of the year as I feel bad for everyone who was expecting the album this year. But the lead song won't be the track I've done with Emeli Sandé – that's for the album [Glassheart]." Lewis released Hurt: The EP in December 2011 to appease fans who were waiting Glassheart. The EP consisted of cover songs which had been re-tooled by Smith. During the middle of March, Lewis posted a picture of herself in the studio with Jahlil Beats and Smith, confirming that Smith was now producing material for Glassheart. Later following Lewis's performance at the Radio 1 Hackney Weekend in June, it was confirmed that Smith was overseeing the production for the remainder of the album and had been hired as the project's executive producer. Norwiegen songwriter Ina Wroldsen joined some of Lewis and Smith's studio sessions, notably contributing to the song "Come Alive". Orchestral collective the Wired Strings joined Smith in the studio in June 2012, to record the strings section for the song "I to You". Smith produced the composition while Rosie Danvers handled the arrangement.

Album artwork and title
Lewis worked with photographer Guy Aroch for the album photoshoot in a vintage apartment, with lots of the shots featuring Lewis posing against walls. The artwork itself was unveilled on 5 September 2011. An editor for The Metro described the photo used for the cover, Lewis stares directly at the camera "in a continuation of the more sexy and sophisticated look she has been sporting in recent months." The reviewer commented on Lewis's styling: "Her long dark hair is swept back from her face, aside from her ruffled fringe, while two black stars have been carefully applied below her eyes, adding to the overall dramatic effect." Becky Bain from music website Idolator, commented that although "Lewis looks beautiful", the image processing makes her look "incredibly washed out in this over-saturated photo" and Bain was less impressed with the star-like beauty marks on Lewis's face. A cover for the deluxe edition will feature images of fans interacting or posing with a heart, and will be selected through entries to a competition run by Lewis's official website. Additionally in the United Kingdom, Play.com is offering exclusive signed copies of Glassheart whilst HMV is offering versions of the album with an exclusive slipcase. Through an official blog, Lewis confirmed that 3,000 limited edition signed copies were shipped exclusively to Play.com.

The album title "Glassheart" was inspired from a conversation that Lewis had with record producer and frequent collaborator Ryan Tedder. During the conversation Tedder asked Lewis about her past experiences with love and life in general. Lewis spoke candidly on the subject resulting in Tedder coming up with the word "Glassheart." During an interview with Clyde 1 radio, Lewis said "Glassheart represents protecting your heart, yourself and protecting your emotions, its very poignant".

Songs and lyrics
Lewis unveilled the official track listing of the standard edition of Glassheart on 9 September 2012, which excluded the first single "Collide" (with Avicii). A two-disc deluxe edition was also released alongside the standard version, "Collide" features as the sixth track on disc 2, as per a question and answer session Lewis did with fans. The album was executively produced by Fraser T Smith, who confirmed in June 2012 that he was "taking a production role for the whole album as well as co-authoring about half its tracks". Syco Music's MD and A&R representative Sonny Thkrar said that Smith was brought on board to "weave a creative thread through the album", elaborating that Smith was ensuring that there was continuity in "the vocal recording, the style, the production and songwriting." Smith also commented that his aim was for "Lewis to make an artist album rather than it being a collection of songs."

Glassheart opens and closes with two different versions of the lead single, "Trouble," described by Sylvia Patterson of The Guardian as "very London". "Trouble" was written by Lewis, alongside a British songwriting collective consisting of British R&B-soul singer Emeli Sandé, Hugo Chegwin, Harry Craze, Shahid Khan and Smith, with primary production coming from Khan under his production name Naughty Boy. It contains elements of trip hop and was inspired by Lewis's 2010 break-up with childhood sweetheart Lou Al-Chamaa. Lyrics co-written by Lewis include the lines "I told you never to get used to me, I stay awake while you fall asleep. I'm a whole lot of trouble, we're in a whole lot of trouble. You shout louder than you used to, and you hold on tighter in the bedroom." When Smith was brought on board with Glassheart, "Trouble" was amongst one of the songs he would work on; a new rap verse by Childish Gambino was added along with some additional production. "Trouble" was an early contender for the second single on Glassheart, being selected in September 2011, prior to the album's pushbacks; it was released on 5 October 2012 as the album's second release and lead single preceding the album by a week. Early critics praised the song's emotive qualities and dark undertones.

"Un Love Me," a song described by Smith as "radio friendly" and "a classic Leona Lewis record", appears on the album's second slot. It was written by Smith, Bonnie McKee and Kelly Sheehan; McKee's previous credits include songs for Katy Perry and Britney Spears, while Sheehan is most noted for writing for Mariah Carey. Upon reviewing the album, critics also noted the radio-friendly qualities of "Un Love Me" and praised its cridentials as a single. It is built around guitar riffs and "thudding bass beats" while Lewis sings in her falsetto. Critics compared the song to work by Indie band Snow Patrol. The third track on the album "Lovebird" is a midtempo ballad which uses a organ-based introduction, similar to that used in Lewis's debut single "Bleeding Love", and is then layered with piano melodies in the chorus which critics compared to those used in Lewis's single "Better in Time". A dubstep and drum and bass-inspired song, "Come Alive" written and produced by Smith with co-writing from Lewis and Swedish songwriter Ina Wroldsen features as the fourth song. Lewis commented that the song had a dark tone and energy. Critics noted the song's heavy electronic production which includes a techno breakdown towards the end.

Track five is called "Fireflies" and opens with a "rotating piano riff". During the main verses and choruses Lewis's vocals are joined by a strings orchestra, all of which critics noted pointed to strong gospel influences. On the next song, "I to You," once again the production is driven by a string instrument-led melody, which was performed by the orchestral collective Wired Strings, and arranged by Rosie Danvers. The seventh song on the album is called "Shake You Up," which critics described at a "modern remake" of an 80's pop song. It was written by Rodney "Darkchild" Jerkins and British singer-songwriter Olivia Waithe (better known as Livvi Franc). Critics noted that "Shake You Up" starts with a vocal interlude from Lewis, who asks "Can you turn the music up a little bit please?" The production, helmed by Darkchild, uses synths and a midtempo "80's pop" melody. Critics compared it to the early work of the late American entertainer Whitney Houston. "Stop the Clocks" returns to the electronic production present on much of the album, but according to critics it was a "lighter instrumental production" that could have been taken from Lewis's last album Echo (2009).

"Favourite Scar" which appears at number nine and was co-written by Lewis, Tedder, Noel Zancanlla, Roland Orzabal and Curt Smith. It is built around the lyric "You shot me through my heart. Pain never felt so good. Boy, you're my favourite scar," whilst critics noted that it was full of attitude from the beginning, comparing it to songs by Barbadian singer Rihanna. The song is built around a piano riff, which is joined by hip hop beats; Lewis Corner from Digital Spy said "it's not the kind of Ryan Tedder collaboration we've come to expect from LeLe." Track ten, "When it Hurts" is a piano-led ballad that also features some elements of electronic guitar. The album's title song "Glassheart" is also a Tedder production and sits at number 11. Speaking of working with Tedder, Lewis described how the title track came about during a visit to Denver, Colorado: "I remember, when I was a little bit down. I went to Denver to hang out with Ryan [Tedder] – to see him and his family – and see if we could come up with something nice. I remember just not wanting to sing a ballad or anything that would make me more sad. I was like, 'Can you give me a song where I can just dance and jump around?', and he was like, 'What about this?' – he played this beat and it was really hypnotic. So I was like, 'Yes! We have to do this'." It was co-written with Zancanella and OneRepublic guitarist Brent Kutzle. Smith also added some production elements to the song. Critics noted that "Glassheart" was a distinctive change in sound for Lewis, with its production featuring elements of dance, grime and dubstep. Critics noted that after several ballads, the up-tempo "Glassheart" was a "welcome change of pace."

The album closes with a "down-tempo ballad" called "Fingerprint," which was written by Lewis, Laura Pergolizzi and Smith, Critics noted that the song was a showcase for Lewis's vocals; Lewis begins the song singing in her lower register before moving to her falsetto. The song is produced atop a "delicate piano riff" which are later joined by "crashing echoes" and "strings" section. The chorus is built around the lyric "No match, no match, no match for your fingerprint/ No substitute, no other you." A rap edit of "Trouble" which features Childish Gambino is also included as track thirteen; Gambino raps a "witty and poetic verse" during the song's middle eight section.

The deluxe edition features six additional tracks which on on CD versions of the album, feature on a second disc. The first three songs are acoustic performances of "Trouble", "Come Alive" and "Glassheart". Tracks four and five are two new songs not featured on the standard edition. "Colorblind" is song number four, while number five is a song called "Sugar" that Patterson described as "an orchestral landscape." "Sugar" was written by Sandé and Al Shux. The second disc closes with the Afrojack remix of album's first single "Collide." The song attracted controversy by drawing close comparisons to "Penguin", a 2010 instrumental song by Swedish DJ Tim "Avicii" Berg. Berg would later take Lewis and Sony Music to court to sue for plagarism, before the case was resolved out of court by releasing "Collide" as a collaborative single between Lewis and Avicii.

Influence and sound
In February 2011, Lewis said about the album will be more experimental compared to previous records Spirit and Echo, embodying a "different" yet "classic" sound. She added, "I’m really, really excited about it. I’m working with some new producers, some up and coming people and it’s going to be kind of a different sound – but still classic". Lewis suggested the album would be "a bit different from what people have heard" from her before, adding that she planned to "go in and create and just see what happens". Lewis later described the album as "more progressive", "more electric", "more uptempo" and "a bit darker". The Sun reported that the album had taken a dubstep direction, with songwriters asked to submit dance songs and no ballads. The song "Come Alive" experiments with dubstep and drum and bass, In March 2012, after adding more time to the album's recording sessions Lewis elaborated on the evolution of her sound, "I've got a track that's got a bit of drum 'n' bass at the end. It's quite different to what I've had out before." Lewis then went on to add "I've got a track that's very '90s. It's just different influences that I've had through my life growing up. I'm really actually looking forward to people hearing it."

Throughout the development of the album Lewis explained that she wanted to make an album that is "timeless". In June 2011, when asked about the upcoming album, Lewis described it as "energetic, deep, [and] unique". She also commented that it would have a darker tone and that she would be putting her "heart into [her] lyrics". She cited Tracy Chapman, Kate Bush and Tears for Fears as the album's primary influences. Lewis spoke on the sound of the album saying "Well, when I was on tour, we mixed a lot of dancer beats on it – my cousin actually reproduced a lot of the ballads. I've taken more of that sound into the album; we've got a lot of piano and live instrumentation. I've a song called 'Fireflies' which I really, really love and hope we get to do as a single. it's a really good one. And it's got a guy on it!" She explained "So the album is such a eclectic mix. I've really got to delve into every kind of music that I love, really try everything and make the best of everything. Because I love so many different genres, it's kind of hard to just pick one thing to do, so I just did everything!"

During an interview with Digital Spy, Tedder said he was inspired by the movie Tron: Legacy (2010) amongst other things, and "wanted to suprise and shock people". On the songs, Lewis said that Tedder "used these synthetic melodies that go up and down the scale, really, really fast." During a uStream chat with fans, Lewis announced she would be rapping on the album after "discovering a voice for rap", comparing her London MC style to American hip-hop rapper/singer Nicki Minaj. Following Smith being brought on board with the album, Lewis confirmed that the album was a mixture of "programmed synths and live music". Smith described the album vocals as "fantastic," commenting to Digital Spy that Lewis "is making a very relevant record...[it is] a very important record for her. The songs are really strong". In a separate interview with Popjustice in July 2012, Smith said that Lewis had "turned up raw emotions" and produced a "classic sound". In June 2012, following her performance of the song "Come Alive" at Radio 1's Big Weekend, Lewis was asked if "Come Alive" was a good indication of the rest of the album. She replied, "It's definitely a piece of it, but there's much more quiet-sounding instrumentals." During a September interview for the Birmingham Mail, Lewis elaborated that she was influenced by American R&B singer Drake's "laidback beats," whilst expaining that the majority of the album is a mixture of electronic instruments and live instruments.

Marketing
On July 23, 2012 Lewis released her first video on the lead up to the release of the album saying “In the lead-up to my album, I wanted to make some video blogs and share with you my journey (!) and everything that goes on, from the video I’m doing very soon, to going on the road doing shows. Every week I’m going to be doing a little video blog and this is the first one.” A second blog entry on 10 August, showed Lewis heading to some studios to record some acoustic performances of the album's songs. Later, another blog revealed that five songs had been recorded with the backing track provided solely by piano and cello. The first of those acoustic performances was for the album's lead single, "Trouble" featuring American rapper Childish Gambino. Filmed in black and white, and featuring Lewis singing a solo version of "Trouble", the black and white performance was released through Lewis' official Vevo account on 5 September 2012.

A newsletter to fans on 24 August 2012 about the upcoming release of the album's lead single "Trouble" and officially unveiled details about a competition for aspiring musicians. In association with TalentHouse, fans have the opportunity to produce their own remix of the song to be entered into a competition to win the chance of having their remix released exclusively through Lewis's official website. Lewis and Fraser T Smith (co-producer and co-writer of the song) will be amongst the judges. Additionally, a separate competition is being run in which fans have the opportunity to feature on the album's deluxe edition artwork. Fans were encouraged to send in pictures of themselves interacting with a heart (or hearts), of which a selection of the images will be used for the deluxe edition cover. During a promotional tour of UK radio stations, Lewis premiered the album's title track on 19 September 2012, on Capital FM's In Demand program. Two days later, Lewis premiered "Stop the Clocks" live on Graham Norton's Saturday morning radio show on BBC Radio 2. On 26 September 2012, Gene Simmons' daughter Sophie Tweed-Simmons auditioned for the second season of The X Factor USA; during the judges comments on the performance, a snippet of "Fireflies" was played in the background.

Live performances
On 3 September 2011 Lewis performed "Collide" for the first time on the first episode of Simon Cowell's new gameshow Red or Black?. She then performed the song along with the album's title song "Glassheart" at London's G-A-Y nightclub. Then in June 2012, Lewis performed during the opening slot of BBC Radio One's Hackney Weekend. Lewis's performance was directed by Steve Anderson and was choreographed by Lewis's boyfriend Dennis Jauch. The set-list consisted of Skylar Grey's interpretation of "I'm Coming Home" (with special guest Wretch 32), a mash-up of previous single "Better in Time" with Rihanna's "Man Down", as well as "Come Alive" (a new song co-written by Fraser T Smith and Ina Wroldsen), "Collide" and "Run". A remix of "Collide" produced by Anderson was specially commissioned for the performance, while the Hackney Empire Community Gospel Choir joined Lewis's performance of "Run".

She reprised her performance of "Come Alive" during an acoustic set at the Amberliegh Charity Foundation Event on 25 August 2012. The set also included previous singles "Run", "Bleeding Love" and "Better in Time", in addition to covers of "Apologize" by OneRepublic and "Grenade" by Bruno Mars. On 11 September 2012, Lewis held an acoustic gig for an intemate crowd at London's Annabel Nightclub. The set-list included new songs from Glassheart, while the audience included Lewis's parents Aural and Maria as well as models Kelly Brook, Annabelle Neilson and Indian businessman Arun Nayar. Lewis is also set to perform "Trouble" live on the ninth series of The X Factor, the same show which launched Lewis's career seven years earlier. According to Music Week, Lewis will perform on the weekend of 6 & 7 October, directly preceding the song's release. During the album release week, Lewis will perform on Alan Carr: Chatty Man on 12 September before returning to London's G-A-Y nightclub, almost a year after Lewis appeared at G-A-Y to perform album's title song and "Collide". Lewis's set will be supported by the first eliminated act from the ninth series of The X Factor.

Singles
On 14 July 2012, it was announced that the album's first single "Collide" would have its first play on BBC Radio 1's The Scott Mills Show. The Autumn Rowe-penned dance-pop song quickly attracted controverst after it was claimed to have plagarised Swedish disc jockey Avicii's 2010 song "Penguin". Avicii took the case to the British High Court just prior to its release, however the case was resolved out of court. "Collide" was released as a joint single between Lewis and Avicii on 4 September 2011. Critical reception of the song was mixed, with critics torn between the Lewis's ability to "deliver power ballad lyrics into a dance orientated song" with the song's production which "seemed to build and drop at the wrong times" with an incohesive structure. "Collide" was moderately successful, in the issue of Billboard magazine dated 9 August 2011, it became the "Hot Shot Debut" on the US Billboard Hot Dance Club Songs, debuting at number 32, three weeks before its official release date. In its seventh week the song topped the chart, becoming Lewis' first number one dance single. In Ireland and the United Kingdom, "Collide" debuted at number three and four respectively.

Before the album's pushback into 2012, during an interview with Digital Spy, Lewis noted that a song called "Trouble" was being lined up as the second single. The song contains elements of trip hop and is inspired by trip hop pioneers, Massive Attack. Glassheart was subsequently pushed back a number of times into 2012,  yet in June 2012, Lewis confirmed that "Trouble" which was co-written by herself and Emeli Sandé would still be the second release, and lead single from the album. It was revealed that during the delay of the album, American rapper Childish Gambino was now featured on the song, which premiered 21 August 2012. Fans can enter a competition to produce their own remix of "Trouble", which will be released alongside the single. Lewis filmed a music video for "Trouble" with Teen Wolf actor Colton Haynes playing her love interest on 22 August 2012. It was released in Ireland on 5 October 2012 with the backing of Sony Music executives, after executive Sony Thakrar told Music Week that "Trouble" was a global priority.

In the week beginning 1 October 2012, Lewis confirmed that she was beginning to get ready to begin filming a music video for next single.

Critical reception
The Daily Mirror's Dean Piper was amongst the first to review Glassheart, and called the album "a reminder of Lewis's extraordinary talent". Unsure of whether "Leona has found her way as an artist or whether she's worked with the right people in the right situation to ensure it's deemed a hit", Piper thought that the album was Lewis's most personal to date. "Trouble" was noted as "easily the best thing" on the album, while the collection as a whole was described as "dark, moody, emotive, mysterious and full of anger." Piper concluded his review with a four out of five star rating, and ended by saying "It just still feels like this is an artist finding her feet and working out how to settle into a career with longevity... this isn't an album that will translate to a universal audience in an Adele stylee [...] there's no doubting [Lewis] is a great singer."

Track listing
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