- flute, English horn, clarinet, bassoon and horn
- A Cool Glow of Radiation (1966)flute and stereo fixed medium
- À corps défendant (2021), 9:35multichannel fixed medium
- flute, clarinet, piano, percussion, violin and cello
- À huit (2001), 19:258 spatialized saxophones
- À la prochaine, la taupe! (1978), 14:55fixed medium
- À la source d’Hypocrène (1981)2 flutes, clarinet, trumpet, harp, harpsichord, celesta, 2 percussions, violin, viola and cello
- À l’aventure! (1990), 12:05orchestra
- … à mesure (1997), 13:006 musicians
- A Mir Prelude and Fugue, 6:10
- A Mirror on Which to Dwell (1976)soprano, flute (piccolo, flute in
G ), oboe (English horn), B-flat clarinet (E -flat clarinet), bass clarinet, piano, percussion, violin, viola, cello and double bass - A mouth-piece (1970)6 mixed voices and processing
- À perte de vue… (2018)orchestra
- À propos… et le Baron Perché? (1985), 14:002 clarinets (bass clarinets), 2 bassoons (double bassoons), 2 horns, trumpet, 2 trombones and double bass
- À quelle heure commence le temps? (1999), 28:00bass-baritone, piano solo and chamber orchestra (15)
- A Single Brushstoke (2008-09), 20:00saxophone and orchestra
- A Song of the Degrees (1972), 18:002 pianos and percussion
- A Tangle in the Throat (2003), 15:00orchestra
- A Void Not Filled With Words (1984), 15:00saxophones and percussion
- L’abécédaire à mon père (1998)
- … about to dawn… (2011)violin, cello and fortepiano
- Abysm (2000), 23:0012 musicians
- Accelerando (2016), 12:00orchestra
- Accident (2001), 12:00soprano saxophone and processing
- Accident (Tombeau de Grisey) (2004), 15:002 clarinets, horn, trumpet, trombone, percussion, piano, 2 violins, viola, cello and double bass
- Accord (1985)oboe, accordion and cello
- Accord réciproque (2017), 5:00cello and fixed medium
- Acht Flöten Fest für Robert Aitken in Freiburg (2004), 3:308 flutes
