- Attitudes (Opéra) (1977)soprano, synthetizer, 2 pianos, percussion and film
- Attraction (2015), 13:00bass clarinet and processing
- Au carré, contre toute vraisemblance (2015), 12:00
- Au loin, l’artifice (1978), 15:02
- Au regard des solstices (2016), 10:00
- Au revoir les moulins (2009), 4:28chamber orchestra
- Aubes (1990), 15:00bass flute, double bass and percussion
- L’audition (2014), 12:00trumpet and processing
- Alabama Song, 5:00
- Aún es tiempo de las mariposas (2016), 8:00
- Aurélia (2006), 4:09musique de scène pour une pièce de théâtrepiano and string orchestra
- viola, cello and double bass
- Ausone (1980)flute
- Ausone (version B) (1979)flute and 2 harps
- Ausone (version C) (1979), 12:002 harps, 2 guitars, 2 violins, 2 violas and 2 cellos
- Autoportrait sur Times Square (2001), 18:00flute, clarinet, violin, cello and piano
- Autour (1977)flute, clarinet, percussion, violin and cello
- Autour d’Ainola (1986), 34:00orchestra
- Aux premières lueurs (2014), 20:00string quartet and processing
- AuXauralités — Vers le cristal… (2021), 11:30fixed medium
- Available Forms I (1961)flute, oboe, E-flat clarinet, B-flat clarinet, bass clarinet, bassoon, horn, trumpet, trombone, harp, piano, 2 percussions, 2 violins, viola, cello and double bass
- Ave, Nr 58 1/2 (1984-85), 23:30alto flute and basset horn
- Ave Maria (1991)voice and guitar
- 8 voices
- Avec, Wampum symphonique (1992)soprano, bass, narrator, four-voice chorus, clarinet, percussion, piano and string instrument
- Aventures en Orient (2010), 7:56chamber orchestra, shakuhachi (or flute) and eastern singer (or western singer)
- awkwardly skirting disaster (2001-03), 12:00cello
