Appearances
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- Backing vocals on The Animals' Love Is (1968) [17]
- Drums on most of Kevin Ayers Joy of a Toy (1969)
- Drums on two tracks of Syd Barrett The Madcap Laughs (1970)
- Harmony vocals on "Whatevershebringswesing" on Kevin Ayers's Whatevershebringswesing (1971)
- Drums and vocals on Daevid Allen Banana Moon (1971)
- Drums on The Keith Tippett Group Dedicated To You, But You Weren't Listening (1971)
- Drums on Keith Tippett's Centipede Septober Energy (1971)
- Drums on Don "Sugarcane" Harris Sugar Cane's Got the Blues (1971)
- Harmony vocals on "Hymn" on Kevin Ayers Bananamour (1973)
- Percussion on Kevin Ayers June 1, 1974 (1974)
- Percussion and backing vocals on Brian Eno Taking Tiger Mountain (By Strategy) (1974) [18]
- 2nd lead vocals on "Calyx" on Hatfield and the North Hatfield and the North (1975)
- Vocals and percussion on Phil Manzanera Diamond Head (1975)
- Vocals on Michael Mantler The Hapless Child (1975/76)
- Vocals on John Cage "Experiences No. 2" and The Wonderful Widow Of Eighteen Springs on Jan Steele/John Cage's Voices and Instruments (1976)
- Vocals on Michael Mantler Silence (1976)
- Vocals on "Bad Alchemy" and "Little Red Riding Hood Hits the Road" on Henry Cow Concerts (1976) [19]
- Piano on "1/1" and "1/2" on Brian Eno Ambient 1: Music for Airports (1978)
- Recorded a one-minute piano/vocal version of "Strangers In The Night" for the compilation album Miniatures - a sequence of fifty-one tiny masterpieces produced by Morgan Fisher (1980)
- Drums on Kevin Coyne Sanity Stomp (1980)
- Vocals on Nick Mason Fictitious Sports (1981)
- Drums on one track of The Raincoats Odyshape album (1981)
- Keyboards on Scritti Politti Songs to Remember (1982)
- Wyatt released Summer Into Winter in collaboration with Ben Watt (1982), an EP of extra tracks for Watt's 1987 album North Marine Drive
- Vocals on two tracks on The Last Nightingale (1984) [20]
- Vocals on four tracks on News from Babel Letters Home (1986) [21]
- Vocals on three tracks on Michael Mantler Many Have No Speech (1987)
- Vocals on Ultramarine United Kingdoms (1993)
- Vocals on one track on Michael Mantler The School of Understanding (1996)
- Vocals on three tracks on John Greaves Songs (1996)
- Vocals, trumpet, vocal percussions, whistle and backing vocals on one song on Cristina Donà Nido (1999)
- Vocals on Michael Mantler Hide and Seek (2000)
- Vocals on Pascal Comelade September Song EP (2000)
- Vocals on one track on Anja Garbarek Smiling & Waving (2001)
- Vocals on two tracks on Bruno Coulais motion picture soundtrack Travelling Birds (2001)
- Cover version of "Love" on Uncut Presents: Instant Karma 2002; a Tribute to John Lennon (2002) [22]
- Vocals on "Submarine" on Björk's Medúlla (2004)
- Spoken word and trumpet on "Re-arranging the 20th Century" on Gilad Atzmon's Musik (2004) [23]
- Vocals on six tracks on Michael Mantler Review (compilation – 2006)
- Readings on some tracks on Max Richter Songs from Before (2006)
- Cornet on the song "Then I Close My Eyes" on David Gilmour On an Island (2006)
- Vocals on the song "Flies" with Brian Eno on Plague Songs (compilation – 2006) [24]
- Guest cornet on Clear Frame (Lol Coxhill, Charles Hayward, Hugh Hopper, Orphy Robinson) (2007)
- Cornet on the song "Then I Close My Eyes" on David Gilmour Remember That Night (2007)
- Wyattron on "Cold Shoulder" on Kevin Ayers The Unfairground (2007)
- Vocals on "This Summer Night" on Bertrand Burgalat Chéri B.B (2007) – released in 2008 as a limited edition 12" vinyl single (500 copies only)
- Vocals and shared song-writing credits on two tracks for Monica Vasconcelos' album Hih (2008)
- Backing vocals on "I Keep Faith" on Billy Bragg Mr Love & Justice (2008)
- Hand Drums on two songs on Everything That Happens Will Happen Today by David Byrne and Brian Eno (2008)
- "Camouflage" in collaboration with Barbara Morgenstern on her album BM (2008)
- Trumpet and piano on "A Song for Alice" on Paul Weller 22 Dreams album (2008)
- Vocals on Hot Chip (featuring Geese) EP (not the LP of the same name) Made in the Dark (2009)
- Vocals (partly lead, partly backing) and trumpet on some tracks on Jeanette Lindström Attitude and Orbit Control (2009)
- Vocals on "Sad Eyes" on Dave Sinclair album Stream (2011)
- Lead vocals and horn on "When U Love Somebody" and backing vocals on "No Water" on Ian James Stewart's album Junk DNA (2013). [25]
- Vocals, cornet and horn on "Stella Maris" by Robert Wyatt and Boris Grebenshchikov (2015)
- Cornet on the song "The Girl in the Yellow Dress" on David Gilmour Rattle That Lock (2015)
- Vocals, Tenor Horn on the song "Ibrahim" on The Great Divide's Ibrahim EP (2016)
- Trumpet on the song "She Moves With The Fayre" on Paul Weller A Kind Revolution (2017)
- Vocals & Source Sounds on "What Light There Is Tells Us Nothing" on Janek Schaefer What Light There Is Tells Us Nothing LP (2018)
- Vocals on three tracks on Mary Halvorson's Code Girl Artlessly Falling (2020)