"Immortal" was originally released with different lyrics, and a different arrangement, as the song "Baby I'm Down" by Leslie West on Mountain, Leslie West's first solo album (which some consider to be the first Mountain album). Clutch covered the song on this album, rearranging it and changing the lyrics. Clutch's version features a guitar solo by Leslie West. Mountain then covered this version of the song on their Mystic Fire album.
Clutch vocalist Neil Fallon has stated that of all Clutch's albums, this is his least favourite.