The Beats had a pervasive influence on rock and roll and popular music, including the Beatles, Bob Dylan and Jim Morrison. The Beatles spelled their name with an "a" partly as a Beat Generation reference, and John Lennon was a fan of Jack Kerouac. The Beatles even put Beat writer William S. Burroughs on the cover of their album "Sgt. Pepper's Lonely Hearts Club Band." Ginsberg later met and became friends of members of the Beatles, and Paul McCartney played guitar on Ginsberg's album "Ballad of the Skeletons."