Which composer who studied under John Cage created a piece which involved the manipulation of electric metronomes?
Music for Electric Metronomes:  The piece involves the manipulation of electric metronomes, followed by various unspecified sounds and actions. Toshi Ichiyanagi: Toshi Ichiyanagi (一柳 慧 , Ichiyanagi Toshi , born 4 February 1933) is a Japanese composer of avant-garde music.
Toshi Ichiyanagi