All selections composed and arranged by Frank Zappa

"For Calvian (And His Next Two Hitch-Hikers)" and "The Grand Wazoo"

Janet Neville-Ferguson - Vocals
Sal Marquez - Vocals, Trumpet Solo on "For Calvin"
Mike Altschul - Woodwinds
Earl Dumler - Woodwinds
Tony "Bat Man" Ortega - Woodwins
Joanne Caldwell McNabb - Woodwins
Johnny Rotella - Woodwins
Fred Jackson - Woodwins
Frank Zappa - Opening Solo on "For Calvin", Guitar
Tony Duran - Bottle-neck solo on "For Calvin", Guitar
Malcolm McNabb - Brass
Bill Byers - Trombone solo on "For Calvin", Brass
Kevin Shroyer - Contractor and Spiritual Guidance, Brass
Ernie Tack - Brass
Erroneous - Bass
Bob Zimmitti - Percussion
Alan Estes - Percussion
Don Preston - Mini-Moog
Aynsley Dunbar - Drums

"Cletus Awreetus-Awrightus"

Bernie Watts - Sax Sool, Woodwinds
Mike Altschul - Woodwinds
Sal Marques - Brass
Kevin Schroyer - Multiple Trombones, Brass
George Duke - Keyboards, Vocals
"Chunky" - Vocals
Frank Zappa - Vocals, Guitar
Erroneous - Bass
Aynsley Dunbar - Drums

"Eat That Question"

Joel Peskin - Woodwinds
Mike Altschul - Woodwinds
Sal Marquez - Brass (multiple-toots)
Lee Clement - Percussion (on gong)
George Duke - Keyboards
Frank Zappa - Guitar, Percussion
Erroneous - Bass
Aynsley Dunbar - Drums

"Blessed Relief"
Mike Altschul - Woodwinds
Joel Paskin - Woodwinds
Sal Margues - Brass
George Duke - Keyboards
Tony Duran - Rhythm Guitar
Frank Zappa - Lead Guitar
Erroneous - Bass
Aynsley Dunbar - Drums

Produced by Frank Zappa
Cover Illustration - Cal Schenkel
Recorded at Paramount Studios, Hollywood
Engineer - Kerry McNabb
Special technical assistance - Paul Hof
Bizarre Biznis - Herb Cohen