The Duo Goebbels/Harth ( 1975–1988 ) , combining German composer , music-theatre music.group_membership and keyboardist Heiner Goebbels and German composer , multi-media artist and saxophonist Alfred 23 Harth became famous for its adaptation of and departure from European composers , especially Hanns Eisler , implemented in a provocatively fresh manner into structured free improvisations and deploying content from areas beyond music .