Question: What co-founder of the band Pink Floyd wrote and performed "Granchester Meadows"?

Context paragraphs:
The Pink Floyd and Syd Barrett Story: The Pink Floyd and Syd Barrett Story is a 2001 television documentary produced by Otmoor Productions for BBC Two's" Omnibus" series and originally called Syd Barrett: Crazy Diamond (in the US, a slightly modified version aired as Pink Floyd & Syd Barrett in the "VH1 Legends" series in January 2002).  Directed by John Edginton, the film includes interviews with all the Pink Floyd members - Roger Waters, David Gilmour, Nick Mason and Richard Wright - plus the "fifth Pink Floyd", Bob Klose, who left the band in 1965, getting their points of view on the original band founder Syd Barrett.  The film includes rare early television appearances of Pink Floyd, and home movies.

List of songs recorded by Syd Barrett: English musician Syd Barrett recorded many songs during his short career as a musician.  One of the founding members of English rock band Pink Floyd, he was the dominant force of the band in their early years, writing most of the material found on their first album, "The Piper at the Gates of Dawn", contributing to their second one, "A Saucerful of Secrets", and recording several unreleased songs with the band.  Due to increasing mental illness, Barrett was excluded from Pink Floyd in April 1968 and was subsequently replaced by guitarist David Gilmour.  After Pink Floyd, Barrett would record two solo albums, both released in 1970, before Barrett left the music business entirely in 1972.

The Australian Pink Floyd Show: The Australian Pink Floyd Show, more frequently referred to as the Australian Pink Floyd, are a Pink Floyd tribute band formed in 1988 in Adelaide, South Australia.  Their live shows attempt to recreate the look, feel, and sound of Pink Floyd's later world tours, employing visual aids such as lasers, inflatables and a large display panel similar to "Mr Screen".  The Australian Pink Floyd Show play venues worldwide.

The Final Cut (album): The Final Cut is the twelfth studio album by the English progressive rock band Pink Floyd, released on 21 March 1983 by Harvest Records in the United Kingdom and on 2 April by Columbia Records in the United States.  It was Pink Floyd's last studio album to include founding member, bass guitarist and songwriter Roger Waters, and their only album on which he alone is credited for writing and composition.  It was also the only Pink Floyd album that does not feature keyboardist Richard Wright.  Waters originally planned "The Final Cut" as a soundtrack album for the 1982 film "Pink Floyd – The Wall".  With the onset of the Falklands War, he rewrote it as a concept album, exploring what he considered the betrayal of his father, who died serving in the Second World War.  Waters sings most of the lyrics; lead guitarist David Gilmour provides lead vocals on only one track.  The packaging, also designed by Waters, reflects the album's war theme.

The Division Bell: The Division Bell is the fourteenth studio album by the English progressive rock band Pink Floyd, released on 28 March 1994 by EMI Records in the United Kingdom and on 4 April by Columbia Records in the United States.  The album's music was written mostly by guitarist and singer David Gilmour and keyboardist Rick Wright, and features Wright's first lead vocal on a Pink Floyd album since "The Dark Side of the Moon" (1973).  Gilmour's new wife, Polly Samson, co-wrote many of the lyrics, which deal with themes of communication.  Recording took place in locations including the band's Britannia Row Studios, and Gilmour's houseboat, "Astoria".  The production team included Pink Floyd stalwarts such as producer Bob Ezrin, engineer Andy Jackson and saxophonist Dick Parry.

Atom Heart Mother (suite): "Atom Heart Mother" is a six-part suite by the progressive rock band Pink Floyd, composed by all members of the band and Ron Geesin.  It appeared on the "Atom Heart Mother" album in 1970, taking up the whole first side of the original vinyl record.  It is Pink Floyd's longest uncut piece (the later "Shine On You Crazy Diamond", though longer, was split between two sides of "Wish You Were Here").  Pink Floyd performed it live between 1970 and 1972, occasionally with a brass section and choir in 1970–71.

Roger Waters: George Roger Waters (born 6 September 1943) is an English singer, songwriter, bassist, and composer.  In 1965, he co-founded the progressive rock band Pink Floyd with drummer Nick Mason, keyboardist Rick Wright, and guitarist, singer, and songwriter Syd Barrett.  Waters initially served as the group's bassist, but following the departure of Barrett in 1968, he also became their lyricist, co-lead vocalist, and conceptual leader.

Pink Floyd bootleg recordings: Pink Floyd bootleg recordings are the collections of audio and video recordings of musical performances by the British rock band Pink Floyd, which were never officially released by the band.  The recordings consist of both live performances and outtakes from studio sessions unavailable in official releases.  In some cases, certain bootleg recordings may be highly prized among collectors, as at least 40 songs composed by Pink Floyd have never been officially released.

A Momentary Lapse of Reason: A Momentary Lapse of Reason is the thirteenth studio album by English progressive rock band Pink Floyd, released in the UK and US in 7 September 1987, on the labels EMI and Columbia.  It followed guitarist David Gilmour's decision to include material recorded for his third solo album on a new Pink Floyd album with drummer Nick Mason and keyboardist Richard Wright.  Although for legal reasons Wright could not be re-admitted to the band, Wright and Mason helped Gilmour craft what became the first Pink Floyd album since the December 1985 departure of bass guitarist, singer, and primary songwriter Roger Waters.

Grantchester Meadows (song): "Grantchester Meadows" is the second track from the studio disc of the experimental Pink Floyd album "Ummagumma."  It was written and performed entirely by Roger Waters.  The song features his lyrics accompanied by an acoustic guitar played by Waters himself, while a tape loop of a skylark chirps in the background throughout the entire song.  At approximately 4:13, the sound of a honking goose is temporarily introduced, followed by the sound of it taking off.  This song was one of several to be considered for but ultimately excluded from the band's "best of" album, "".

Supporting paragraphs: Grantchester Meadows (song) Roger Waters
Answer: Roger Waters