Japanese avant-garde composer and violinst Takehisa Kosugi has died, according to the Merce Cunningham Trust. He was 80 years old. Associated with the Fluxus movement, Takehisa Kosugi was best known for the experimental music he made in the ’60s and ’70s. He began his career as part of the seminal Tokyo-based Group Ongaku, which was one of the first ensembles in Japan to explore collective group improvisation and multi-media performances. He later made a name for himself as a solo artist and member of Taj Mahal Travelers.