The awards are presented by the British Academy of Composers and Songwriters and sponsored by the Performing Right Society. The winners were announced at a ceremony at Ironmongers' Hall on December 9.
Birtwistle won in the choral category for The Ring Dance of the Fragments and in the orchestral category for Night's Black Bird, a work commissioned by the Roche corporation and performed by the Cleveland Orchestra at the Lucerne Festival and Carnegie Hall.
Errollyn Wallen won the BBC Radio 3 Listeners Award for Spirit Symphony: Speed Dating for Two Orchestras. Other winners include Tarik O'Regan for the vocal work Sainte; Michael Finnissy, in the instrumental solo and duo category, for Verdi Transcriptions Book 4; Ian Gardiner in the wind and brass category for Toccata, Canzona, Ricercare; Howard Skempton for the chamber work Tendrils; and Ruth Byrchmore in the liturgical category for A Birthday.
In the new media category, Robert Jarvis won for Disappear, an installation featuring "endangered sounds." Edward Rushton won in the stage works category for his second opera, Birds. Barks. Bones.
The awards ceremony and excerpts from the winning compositions will be broadcast on BBC Radio 3 today at 7 p.m. GMT (2 p.m. ET). The station can be heard over the Internet at http://www.bbc.co.uk/radio3/.