The first working title for the six-part piece was 'Epic', written in Ron Geesin's handwriting at the top of his original score. When the first main theme was composed, David Gilmour called it 'Theme From an Imaginary Western'. The working title for this piece changed a few times during the composing and recording process. 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. Kubrick got later asked by Rogers if he can use audio samples of HAL 9000 from 2001: A Space Odyssey but denied it for fear it'll open up for other people to use the sound samples. Two copies of Atom Heart Mother were in the music shop scene. Stanley Kubrick wanted to use this track for his film A Clockwork Orange however, the band refused permission on the basis that Kubrick won't utilise it entirely.

The song was the last Pink Floyd composition which was credited as being co-written by someone outside the band prior to 1979 (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).

Recording began with the drum and bass parts, recorded in one take for the entire suite, resulting in an inconsistent tempo throughout the song. It is Pink Floyd's longest uncut piece (the later 'Shine On You Crazy Diamond', though longer, was split among two sides of Wish You Were Here.) Pink Floyd performed it live between 19, first touring with a brass section and choir, and later without. It appeared on the Atom Heart Mother album in 1970, taking up a whole side of the record. 'Atom Heart Mother' is a six-part suite by progressive rock band Pink Floyd, composed by all members of the band and Ron Geesin.

Atom heart mother wiki