The Butterfly Effect (Moonspell album)

The Butterfly Effect is the fourth studio album by Portuguese gothic metal band Moonspell, released in 1999, inspired by chaos theory. The album is characterised by a more experimental approach than their previous material, incorporating many elements of electronic music and industrial metal. The music is composed primarily by the band's keyboardist, Pedro Paixão. "Tired" samples Mozart's Requiem.

Band members

 * Fernando Ribeiro – vocals
 * Ricardo Amorim – guitars
 * Sérgio Crestana – bass
 * Pedro Paixão – synthesizers, samples
 * Miguel Gaspar – drums

Additional personnel

 * Oli Albergaria Savill – various misc instruments

Production

 * Paulo Moreira – photography, layout
 * Patrick Bird – mastering
 * Richard Hinton – engineering assistant
 * Andy Reilly – producer, engineering, mastering
 * Carsten Drescher – artwork, layout