In the late 70s-early 80s I was doing a lot of journeyman work with tape - altered, cut up, drawn out, mangled and so on.
Influential electronic music workshops included the BBC Radiophonic Workshop, the Royal Philips Electronics workshop, the Columbia-Princeton Electronic Music Centre, the Oakland’s Mills College group & the San Francisco Tape Music Cente.
Notable influences include Delia Derbyshire & David Vorhaus, Milton Babbitt, Vladimir Ussachevsky and Otto Luening, Edgard Varèse, Charles Wuorinen, Pauline Oliveros, & La Monte Young, Morton Subotnik and Ramon Sender, Todd Dockstader, Pierre Schaeffer, John Cage, David Tudor & Laurie Anderson.
I made a short-run pressing as "Echolalia" of a 45/single, "Test Pattern" which was composed of the A-side "Merlin's Muse #3" and the B-side "2seconds2nonexistence". I think I sold about 5. I gave away lots. I know some weirdo college stations would play it in the wee hours (including local stations WRUW and WCSU).
Here in all their grainy glory are the compositions, done on cassette tape with scissors, posted to You Tube:
Merlin's Muse #3
if you enjoy this type of thing, you might like Orchid Spangiafora's work.