- Spleen (2012), 7:00cello and fixed medium
- Splendor Sine Occasu (2018)piano, violin, viola and cello
- Split Seconds (1988)2 flutes, 2 oboes, 2 clarinets, 2 bassoons, 2 horns, 2 trumpets, piano, 2 percussions, 12 violins, 4 violas, 4 cellos and 2 double basses
- SPP (2000), 12:00soprano saxophone and piano
- Spring, River, and Flowers on a Moonlit Night (2010), 20:00chamber opera2 voices and accordion
- Spring Chicken (2001)clarinet
- Staatstheater (1970)scenic work
- Stabile (2003), 14:35saxophone quartet, processing and 4-channel fixed medium
- Stacheldraht (1994)solo flute, string quartet, female narrator, oboe, clarinet, bassoon, 3 horns, timpani and double bass
- Stairs (2010)Cycle: Visages
- Stanza II (1971)harp and fixed medium
- Stardust (2009), 30:00
- Stark, utter, forego (2003), 24:00piano and orchestra
- Starmania (1978)rock opera
- Stasis (2018), 18:008 spatialized French horns and gongs
- clarinet and percussion
- Stele (1995), 7:002 percussions
- Stele I (2004), 16:00prepared piano
- Stele I Ectoplasm (2009), 16:00prepared piano, jazz trumpet, four percussionists and eight channel live-electronics
- Stele II for Wolfgang Stryi (2005), 8:00violin, cello, bass clarinet and gong
- Stele III for James Tenney (2006)string quartet
- Stele IV for Jürgen Gosch (2009), 10:00trumpets
- Stele IX (2017), 5:00quartet with piano
- Stele V for Dhruba Ghosh (2011-22), 6:00violin
- Stele VI Alaap for Ashok (2011), 12:00comprovising musicians
- Stele VII (2015), 5:00alto flute, violin, cello
- Stèles (2014)violin, cello and piano
- Le Stelle (Les étoiles) (2004), 25:00string quartet and vocal quartet
- STER 1.3 (1969), 3:00stereo fixed medium