In reply to Hugh J:
Fot the full sweep.
Absolutely free - Mothers -1967
Weasels ripped my flesh - Zappa -1970
Over-nite sensation - Zappa -1973
Sheik Yerbouti - Zappa -1979
Jazz from hell - Zappa -1986
Take you from the hippy(ish) period to the early experimental, onto the 'humoristic' period and then the Jazz. I do have a soft spot for Bongo Fury though. All of the above you could interchange with 1 or 2 others.