The Beatles had three songs with "Revolution" in the title. The first, "Revolution", was on the flip side of the "Hey Jude" single and featured fuzzed-up guitars and a piano solo by session musician Nicky Hopkins. "Revolution 1" on the White Album is the same song as "Revolution" only in a more easy listening style. The third, "Revolution 9", also on the White Album, is not exactly a song as it is a tape collage of sound effects thrown together by John Lennon featuring the voices of John and George Harrison, engineer Geoff Emerick, and Yoko Ono at various speeds with some symphonic music, the words "number nine" repeated at various points, and what sounds like fan chatter from a soccer game thrown in. "Revolution 9" is an integral part of the Paul Is Dead hoax theory.