这是Deep Purple一些早先未发行（当时）曲目的汇编专辑。1985年发行了双胶木版，收录了22首曲目，1991年再版发行了双CD版，并增加了曲目，有27首。专辑根据乐队成员组成分了四个时期MK I（1968-1969），II（1970-73），MK III（1974-75）和IV（1975）乐团成员分别为：
Mk I

Ritchie Blackmore - guitar
Rod Evans - lead vocals
Jon Lord - organ, keyboards, backing vocals
Ian Paice - drums
Nick Simper - bass, backing vocals

Mk II

Ritchie Blackmore - lead guitar
Ian Gillan - vocals
Roger Glover - bass
Jon Lord - organ, keyboards
Ian Paice - drums

Mk III

Ritchie Blackmore - lead guitar
David Coverdale - vocals
Glenn Hughes - bass guitar, vocals
Jon Lord - organ, keyboards
Ian Paice - drums

Mk IV

Tommy Bolin: Guitar and vocals.
David Coverdale: Lead vocals
Glenn Hughes: Bass and vocals
Jon Lord: Keyboards
Ian Paice: Drums