Jón Þór "Jónsi" Birgisson (guitar and vocals), Georg Hólm (bass) and Ágúst Ævar Gunnarsson (drums) formed the group in Reykjavík in January 1994. Ágúst Ævar Gunnarsson retired after the release of the second album to be replaced by Orri Páll Dýrason. The band was joined by Kjartan Sveinsson on keyboards in 1998. Kjartan Sveinsson left the band in 2013.
Line-up (2013-now): Jón Þór Birgisson (guitar, vocals), Georg Hólm (bass guitar), Orri Páll Dýrason (drums)