- Race to the Midnight Sun (2018)piano, violin, viola and cello
- Ragtime (1918)flute, clarinet, horn, trumpet, trombone, cimbalom, percussion, 2 violins, viola and double bass
- Rain Coming (1982)14 musicians
- Les raisons des forces mouvantes (1984), 13:00string quartet and flute
- Sudanese gamelan, oud, kanun and nay
- Ramifications (1968-69)7 violins, 2 violas, 2 cellos and double bass
- guitar, harp, voice, violin and cello
- tenor, 2 sopranos, bass, 2 baritones, 2 mezzo-sopranos, flute, oboe, clarinet, bassoon, horn, harp, piano, percussion, 2 violins, viola, cello and double bass
- Rapsodie des masques (2012), 10:002 flutes, oboe, clarinet, 2 violins, cello, double bass, piano, harpsichord, accordion and percussion
- Rasas I (1968)flute, harp, piano, percussion, violin, viola and cello
- Rasas III (1973)soprano, flute, trombone, piano, percussion and fixed medium
- Raudra (1976)flute
- raW (2003), 11:08piccolo, bass clarinet, violin, cello, piano and drum kit
- Razzia (2004), 8:04string orchestra, piano, nay (or flute), oud (or harp) and 2 percussions
- Re-Illuminations (1988)flute
- Re-Rea[lized] (2015)piano
- fixed medium
- fixed medium
- (RE)volution (2012)electric guitar and orchestra
- Rebonds (1987-88), 8:00skins, woodblocks
- Le réceptacle des immondices (2010), 7:42fixed medium
- Réception (2009), 6:40flute, string instrument, percussion and string quintet
- Reception and Offering Music (1975), 16:00wind quintet and percussion
- Récit (1987), 10:002 piccolos, 2 flutes, 3 oboes, 3 clarinets, 3 bassoons, 2 horns, 2 trumpets, 2 trombones and tuba
- Le récital (1992), 5:26
- Récitatif, air et variation (1970)12 mixed voices
- Récitations (1978), 40:00female voice
- Recitative of Nightingale (2009)zhonghu, sheng, suona and orchestra
- violin, cello and piano
