Alterations was a chaotic and intensely creative British free improvisation quartet featuring Peter Cusack, Terry Day, David Toop, and Steve Beresford who were in action together from 1977 to 1986. Alterations' music was entirely freely improvised from start to finish, with each musician intentionally trying to destroy what the others were constructing. Rarely would any group member stick to any one instrument during a song; often switching from piano, to drums, to saxophone, to electric guitar, to toys, to violin, to electric devices, and so on (even playing each other's instruments).

Read more about Alterations on Last.fm.