Extremely active from 1972-82, then reformed in 2008, and now entering a new phase of their improvisational journey, the OM quartet of Urs Leimgruber on saxophones, Christy Doran on electric guitar, Bobby Burri on double bass, and Fredy Studer on drums & percussion extend their transformative approach to free improv through what they refer to as "ElectroAcoustiCore".

Irish guitarist Christy Doran in a quintet with NY Downtown stars Hank Roberts (cello) and Marty Ehrlich (reeds), UK legend Ray Anderson (trombone) and Swiss sax master Urs Leimgruber, in recordings from 1989-1991 showing incredible melodic, technical and creative skills.