Avant-garde pianist and composer Toshi Ichiyanagi, who studied with John Cage and went on to lead Japan’s advances in experimental modern music, has died. He was 89. Ichiyanagi, who was married to Yoko Ono before she married John Lennon, died Friday, according to the Kanagawa Arts Foundation, where Ichiyanagi had served as general artistic director. The cause of death was not given. “We would like to express our sincerest gratitude to all those who loved him during his lifetime,” the foundation’s chairman, Kazumi Tamamura, said in a statement Saturday. ALSO READ | 5th Echoes of Earth music festival to promote...