The first disc contains the album In a Priest Driven Ambulance, followed by related b-sides from that era. The second disc contains a much-bootlegged series of demos called The Mushroom Tapes, featuring early versions and alternate mixes of Ambulance tracks.
The first disc of this set was released on vinyl as a limited-edition, pink-colored two-record set under the title of In a Priest Driven Ambulance.
The compilation is named after a line from the Flaming Lips song "Five Stop Mother Superior Rain". It also includes new liner notes from band frontman Wayne Coyne.