Frank Zappa--all guitars, lead vocals on Po-Jama People, Evelyn and Sofa No. 2, bg vocals on other tunes
George Duke--all keyboards & synthesizers, lead vocals on Inca Roads, Andy and Sofa No. 2, bg vocals on other tunes
Napoleon Murphy Brock--flute and tenor sax, lead vocals on Florentine Pogen and Andy, bg vocals on other tunes
Chester Thompson--drums; gorilla victim
Tom Fowler--bass (when left hand is not broken)
Ruth Underwood--vibes, marimba, other percussion
James "Bird Legs" Youmans--bass (on Can't Afford No Shoes)
Johnny "Guitar" Watson--flambe vocals on the out-choruses of San Ber'dino and Andy
Bloodshot Rollin' Red--harmonica when present
George Duke--all keyboards & synthesizers, lead vocals on Inca Roads, Andy and Sofa No. 2, bg vocals on other tunes
Napoleon Murphy Brock--flute and tenor sax, lead vocals on Florentine Pogen and Andy, bg vocals on other tunes
Chester Thompson--drums; gorilla victim
Tom Fowler--bass (when left hand is not broken)
Ruth Underwood--vibes, marimba, other percussion
James "Bird Legs" Youmans--bass (on Can't Afford No Shoes)
Johnny "Guitar" Watson--flambe vocals on the out-choruses of San Ber'dino and Andy
Bloodshot Rollin' Red--harmonica when present