Conversation so far:
what was Jikken Kobo?
Tōru Takemitsu was a founding member of the anti-academic Jikken Kōbō: an artistic group who sought to avoid Japanese artistic tradition.
what kind of projects did the Jikken Kobo produce?
Jikken Kobo produced multidisciplinary collaboration on mixed-media projects
what else did Tōru Takemitsu produce besides multidisciplinary collaboration on mixed-media projects?
During this period Tōru Takemitsu wrote Saegirarenai Kyūsoku I; and by 1955 Takemitsu had begun to use electronic tape-recording techniques in such works as Relief Statique and Vocalism A·I.

Question: was he working on his own or did he get help from others?
Self-contained rewrite: was Tōru Takemitsu working on his own or did he get help from others?