He is best known as a member of the avant garde musical quartet, Alterations (1978–1986; with Steve Beresford, David Toop, and Terry Day),[1] and the creator of field and wildlife recording-based albums including: Cusack has been involved in a wide range of projects throughout his career.
Sites that Cusack is working on include Chernobyl, the Azerbaijan oil fields, and areas around controversial dams on the Tigris and Euphrates river systems in south east Turkey.
As a musician, he has collaborated with artists such as Clive Bell, Nic Collins, Alterations, Chris Cutler, Max Eastley, Evan Parker, Hugh Davies, Annette Krebs and Eastern Mediterranean singer Viv Corringham.
In 1975 Derek Bailey, Steve Beresford, Max Boucher, Paul Burwell, Jack Cooke, Peter Cusack, Hugh Davies, Madelaine and Martin Davidson, Richard Leigh, Evan Parker, John Russell, David Toop, Philipp Wachsmann and Colin Wood formed the journal MUSICS, later described as "an impromental experivisation arts magazine".
Cusack produces the monthly radio program "Vermilion Sounds" with Isobel Clouter.