 Edgard Varese and Aaron Copland were also among its champions.The early years of the Group were tied in, as well, with the early development of electronic music in the United States.Early on the Group affiliated itself with the Columbia-Princeton Electronic Music Center, and many premieres of important new works involving instruments and electronics by such composers as Milton Babbitt, Mario Davidovsky and Vladimir Ussachevsky were presented on its concerts.