wikipedia.org: "Christian Wolff (born March 8, 1934) is an American composer of experimental classical music. At the age of sixteen Wolff was sent by his piano teacher Grete Sultan for lessons in composition with the composer John Cage and quickly became a close associate of Cage and his artistic circle which included composers Earle Brown and Morton Feldman, pianist David Tudor, and dancer and choreographer Merce Cunningham. During the 1960s he developed associations with the composers Frederic Rzewski and Cornelius Cardew who spurred each other on in their respective explorations of experimental composition techniques and musical improvisation, and then from the early 1970s in their respective attempts to engage with political matters in their music." More
