Frank Zappa (guitar, vocals, percussion)
Ray Collins (vocals)
Jimmy Carl Black (drums)
Roy Estrada (electric bass)
Don Preston (electric piano)
Billy Mundi (drums)
Bunk Gardner (piccolo, flute, clarinet, bass clarinet, soprano saxophone, alto saxophone, tenor saxophone, bassoon)
Ian Underwood (electric organ, piano, harpsichord, celeste, flute, clarinet, alto saxophone, baritone saxophone)
Arthur Tripp (drums, timpani, vibes, marimba, xylophone, wood blocks, bells, small chimes)
Motorhead Sherwood (tenor saxophone, tambourine)
Ruth Komanoff (marimba, vibes)

Ian:
My name is Ian Underwood
And I am straight member of the group
( Wowie Zowie)
One month ago I heard The Mothers of Invention at the theater
I heard them on two ocassions
And at the second ocassion
I went up to Jim Black
And I said I like your music,
I'd like to come down to play with you.
Two days later I came up to the recording session

To be continued...