Atom Heart Mother is the fifth studio album by English progressive rock band Pink Floyd, released in 1970 by Harvest and EMI
Records in the United Kingdom and Harvest and Capitol in the United States.
It was recorded at Abbey Road Studios, London, England, and reached number one in the United Kingdom, and number 55 in the United States charts, and went gold in the U.S. in March 1994.
A re-mastered CD was released in 1994 in the UK, and in 1995 in the US.
This was the first Pink Floyd album to be specially mixed for 4-channel quadraphonic sound as well as conventional 2-channel stereo.
The SQ quadraphonic mix was released on LP in a matrix format compatible with standard stereo record players.
There was also a release of the quadraphonic version in the UK in fully discrete 4-channel form on the ˝Quad-8˝ format, a 4-channel variant of the stereo 8-track tape cartridge.