It is a 3CD set that primarily contains unreleased songs written and recorded in 1970, shortly after sessions concluded for the album Hot Rats.

[1][2] After the first incarnation of the Mothers of Invention disbanded, Frank Zappa embarked on a solo career and created the predominantly instrumental and jazz oriented Hot Rats, which would become one of his most acclaimed works.

The group consisted of Ian Underwood, Max Bennett and Don "Sugarcane" Harris, as well as newcomer Aynsley Dunbar, who had recently relocated to Los Angeles and moved in with Zappa.

Much shorter edits of "Transylvania Boogie" and "The Clap" appeared as the first and eighth tracks on Chunga's Revenge (1970).

It features the original Mothers' bassist, and James "Motorhead" Sherwood on rhythm guitar.