Atom Heart Mother

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 UK and Harvest and Capitol in the US. It was recorded at Abbey Road Studios, London, England, and was the group's first album to reach number 1 in the U.K., while it reached number 55 in the U.S. chart, eventually going gold there. A remastered CD was released in 1994 in the UK and the US, and again in 2011. Ron Geesin, who had already influenced and collaborated with Roger Waters, made a notable contribution to the album and received a then rare outside songwriting credit. 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.