A chi fa notte il giorno for speaker (ad libitum) and bass (1993)
Adagio op. 8 for flute, clarinet, bassoon, piano and 2 violins (1966-67)
Addii for violin, cello and piano (1995-96)
Ai piedi del faro for bass concertante and 8 instruments (1986)
Albumblätter for piano(1967-68)
Alle fronde dei salici for 12 voices (1977)
Allegro op. 8 for flute, clarinet, bassoon, piano and 2 violins (1966)
Analisi per tre sintetizzatori (1973)
Ariel’s Songs for 2 soprans, mezzo-soprano and alto (2002-03)
Atropos for orchestra (1991)
Aubade. Omaggio a Henze for orchestra (2001)
Aus nichts wird nichts, radiofonic version of Lucrezio. Un oratorio materialistico. Parte prima: natura (1998)