1784 in music

Events

 * January 5 – In Paris, Antonio Salieri signs a contract with the Opéra for a work entitled Les Danaïdes.
 * January 7 – Composer Pierre-Alexandre Monsigny marries Amélie de Villemagne.
 * February 9 – The Piano Concerto No. 14 becomes the first entry in the catalogue of works by Wolfgang Amadeus Mozart.
 * March – 28-year-old Mozart gives the first performances of his Piano Concerto No. 15 at the Trattnerhof and Burgtheater in Vienna.
 * April 24 – Mozart writes to his father Leopold, recommending the work of newcomer Ignaz Pleyel.
 * April 29 – Wolfgang Amadeus Mozart and violinist Regina Strinasacchi perform Mozart's Sonata in B-flat for Violin and Keyboard (K.454) for the first time, in the presence of Joseph II, Holy Roman Emperor.
 * May 27 – June 5 – Handel Commemoration concerts in Westminster Abbey, London.
 * June 13 – Wolfgang Amadeus Mozart's Piano Concerto No. 17 is performed for the first time, by his student, Barbara von Ployer. Giovanni Paisiello is in the audience.
 * August 17 – Luigi Boccherini is given a pay rise of 12000 reals by his employer, the Infante Luis, Count of Chinchón.
 * August 28 – In Vienna, Johann Georg Albrechtsberger's Mass in E flat is performed for the first time, with the orchestral arrangement replaced by organ accompaniment, in accordance with the preferences of Joseph II, Holy Roman Emperor.
 * December 11 – Mozart is received into the Masonic lodge "Beneficence".
 * The first opera is mounted at the unfinished Teatro Nuovo in Bergamo, Lombardy, Giuseppe Sarti's Medonte, re di Epiro.

Classical music

 * Ludwig van Beethoven - Piano Concerto No. 0
 * Jean-Jacques Beauvarlet-Charpentier – Journal d'orgue 1–9


 * Niel Gow – A Collection of Strathspey Reels, etc.
 * Joseph Haydn
 * 6 Divertimentos, Hob.IV:6–11
 * Keyboard Sonata in G major, Hob.XVI:40 (no. 54)
 * Keyboard Sonata in B-flat major, Hob.XVI:41 (no. 55)
 * Keyboard Sonata in D major, Hob.XVI:42 (no. 56)
 * 24 Lieder, Hob.XXVIa:13–24 (second book)
 * Michael Haydn – Symphony in B-flat major; Symphony in C major
 * Sabine Hitzelberger – Für fülende Seelen am Klavier
 * Edward Jones – Musical and Poetical Relicks of the Welsh Bards, including "Deck the Halls"
 * Leopold Kozeluch – Keyboard Concerto in F major, P.IV:1
 * Wolfgang Amadeus Mozart
 * Piano Concerto No. 14
 * Piano Concerto No. 15
 * Giovanni Paisiello – Six quartets, Op. 1
 * Joseph Reicha – Cello Concerto in D major
 * Giovanni Battista Viotti – Duetto concertante for 2 Violins in D major; Duetto concertante for 2 Violins in D minor

Opera

 * Pasquale Anfossi – Issipile, May 8, King's Theatre, London.
 * Luigi Cherubini – L'Idalide
 * Domenico Cimarosa
 * L'apparenza inganna
 * Artaserse
 * I due supposti conti
 * I matrimoni impensati
 * L'Olimpiade, July 10, Teatro Eretenio, Vicenza.
 * La vanità delusa
 * André Grétry
 * L'épreuve villageoise
 * Richard Coeur de Lion
 * Joseph Haydn – Armida
 * Thomas Linley – The Spanish Rivals
 * Antonio Salieri
 * Les Danaïdes
 * Il ricco d'un giorno (libretto by Lorenzo Da Ponte)
 * Andrea Luchesi – Ademira
 * Giovanni Paisiello – Il Re Teodoro
 * Niccolò Piccinni – Diane et Endymion
 * Antonio Sacchini – Dardanus

Births

 * January 1 – William Beale, composer and organist (died 1854)
 * January 27 – Martin-Joseph Mengal, composer (died 1851)
 * January 29 – Ferdinand Ries, composer
 * February 3 – John Fane, composer and diplomat
 * February 27 – Job Plimpton, composer (died 1864)
 * March 25 – François-Joseph Fétis, Belgian musicologist, composer, critic and teacher (died 1871)
 * April 8 – Dionisio Aguado, guitarist and composer (died 1849)
 * June 14 – Francesco Morlacchi, opera composer (died 1841)
 * July 27 – George Onslow, composer (died 1853)
 * August 5 – Louis Spohr, composer, violinist and conductor (died 1859)
 * August 23
 * Jeanette Wässelius, operatic soprano (died 1853)
 * Henriette Löfman, composer (died 1836)
 * October 15 – Thomas Hastings, composer (died 1872)
 * October 16 – Karl Keller, composer and flautist (died 1855)
 * November 7 – Friedrich Wilhelm Kalkbrenner, German pianist and composer
 * date unknown – Samuel Simms, organist and composer (died 1868)
 * November 28 – Ferdinand Ries, composer and friend of Beethoven (died 1838)

Deaths

 * March 4 – Ann Cargill, opera singer (born 1760) (drowned)
 * July 1 – Wilhelm Friedemann Bach, composer (born 1710)
 * August – Louis Anseaume, opera librettist
 * August 6 – Karl Kohaut, lutenist and composer (born 1726)
 * August 4 – Giovanni Battista Martini, composer (born 1706)
 * September
 * John Bennett, organist and composer (born c.1735)
 * Maria Linley, singer (born 1763)
 * September 12 – Manuel Blasco de Nebra, organist and composer (born 1750)
 * October 5 (or 1785) – Antonín Kammel, violinist and composer (born 1730)
 * November 6 – Anine Frölich, ballet dancer (born 1762)
 * date unknown
 * John Pixell, poet and composer (born 1725)
 * Yekaterina Sinyavina, pianist and composer (date of birth unknown)