However, this caused the tour to lose money, and the band found problems with the hired musicians, which changed from gig to gig as they simply took who was available, which, combined with lack of rehearsal and problems miking up the whole ensemble, made a full live performance more problematic. Later, the band took a full brass section and choir on tour just for the purpose of performing this piece. On both occasions the band were accompanied by the John Alldis Choir and the Philip Jones Brass Ensemble. Two major performances were at the Bath Festival of Blues and Progressive Music on 27 June and the 'Blackhill's Garden Party' in Hyde Park, London on 18 July, convened by the band's erstwhile management partnership, Blackhill Enterprises. An early performance was taped for the San Francisco television station KQED, featuring just the band, on 28 April 1970. The band were initially enthusiastic about performing the suite. Years later, Kubrick refused Roger Waters permission to use audio samples from his film 2001: A Space Odyssey on Waters' solo album Amused to Death. It can be seen on a shelf in the music shop scene. Kubrick did, however, include the album cover in the film. Stanley Kubrick wanted to use this track for his film A Clockwork Orange however, the band refused permission.

The other song is ' The Trial', from the 1979 album The Wall, co-written by Roger Waters and producer Bob Ezrin. The track was one of only two Pink Floyd compositions credited as being co-written by someone outside the band prior to 1987 (not counting Clare Torry's contribution to ' The Great Gig in the Sky', for which she has been retroactively given credit due to a settlement with Pink Floyd). When Roger Waters heard David Gilmour playing the guitar parts for this track, he said that he thought it sounded like the theme song from the western film The Magnificent Seven. Roger Waters and Nick Mason had to play for twenty-three minutes straight. Recording began with the drum and bass parts, recorded in one take for the entire suite, resulting in an inconsistent tempo throughout the song. Pink Floyd performed it live between 19, occasionally with a brass section and choir in 1970–71. At 23:38, it is Pink Floyd's longest uncut studio piece. It appeared on the Atom Heart Mother album in 1970, taking up the first side of the original vinyl record. ' 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. Musical composition by Pink Floyd and Ron Geesin 'Atom Heart Mother'

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