The tracks "Celebration Song" and "My Dark Hour" featured Paul McCartney (credited as "Phil Ramon") on backing vocals, drums and bass guitar.
The primary guitar riff on "My Dark Hour" was also used on the title track to Steve Miller's 1976 album Fly Like an Eagle.
"Space Cowboy" uses the same primary guitar riff as the Beatles' song "Lady Madonna," owing perhaps to McCartney's involvement on "My Dark Hour" and allied permission. It was released as downloadable content for the video game Rock Band on January 20, 2009.
^Castleman, Harry; Podrazik, Walter J. (1977). "1969 – "But If Paul's Alive, How Did He Die?". All Together Now – The First Complete Beatles Discography 1961–1975 (Second ed.). New York: Ballantine Books. p. 78. ISBN0-345-25680-8.|accessdate= requires |url= (help)