"Billy the Mountain" is a Frank Zappa song first made available on the album Just Another Band from L.A. in 1972. The original recording, which took more than a half-hour to perform, was from a live tour performance on August 7, 1971 in Los Angeles, performed by Zappa with his band the Mothers and prominently featuring the musical duo Flo & Eddie. The album recording had to be edited in order to fit on one side of the record. An alternate version of the song was featured on the 1992 album Playground Psychotics, and a third version of the song was posthumously released in 2011 by the Zappa Family Trust on the album Carnegie Hall.