The album features an array of well-known guest musicians, including David Crosby and Graham Nash, who contributed vocals. Ringo Starr drums on two tracks under the pseudonym "Richie,"[3] which he also used for his contribution to the London Sessions album by American bluesman Howlin' Wolf, recorded in England the same year. Stills' album is also the only album in rock and roll history to which both Eric Clapton and Jimi Hendrix supplied guitar work.