Picture and extended biography with links and music samples in MP3 and MIDI.

Education and influences, changes in style, and summary of works from the Grove Concise Dictionary of Music entry at WQXR radio.

Brief biography noting his various styles, especially pluritonality.

Biographical sketch and commtary on his being a father of electronic music from the Classical Composers Database.

Listing of operatic works with premiere date and place and librettist.

List at recmusic.org includes selected texts, some in English or with English translation.