Jazz pianist Ethan Iverson nominates Milton Babbitt's Philomel for soprano and tape, "a classic record that should be owned by all fans of the avant-garde"; Paul Griffiths explains how Babbitt used the timbral and rhythmic resources of the Mark II RCA Sound Synthesizer to help realise his own brand of twelve-tone music. And we hear the voice of the composer himself from recordings made by the BBC in the 1960s.