They are tape musics. At Sogakudo of
Tokyo Geijutsu Daigaku(Tokyo National
University of Fine Arts and Music), by members of
Group Ongaku performed
improvisation.
1958~1961
Duetts for violin and violoncello (several pieces)
1960
"Automatism" and "This is Object!"
---Note---
The concept of "Group Ongaku": see the leaflet of
"Group Ongaku dai 1 kai
ko4en(Group Ongaku Recital No.1)
--(Nippon Kindai Ongakukan)