 The recording is a rarity among non-Beatles songs since it features three members of the band – Harrison, who also produced the track, Ringo Starr and Paul McCartney.Performed in the hard rock style, the song also includes musical contributions from Eric Clapton and session pianist Nicky Hopkins, and was the first of many Harrison productions for artists signed to the Beatles' record label.Harrison wrote "Sour Milk Sea" to promote Transcendental Meditation, which the Beatles had been studying in Rishikesh with Maharishi Mahesh Yogi.