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Tom Waits was the opening act for Zappa and the Mothers Of Invention that night.
After a break in their show, the Mothers returned and Frank brought back Tom Waits to tell his "12-inch man" joke while the band played Wait's "Ol' 55" behind him.

Tom Waits – lead vocals
Frank Zappa – guitar, vocals
Napoleon Murphy Brock – sax, flute
George Duke – keyboards
Ruth Underwood – percussion
Tom Fowler – bass
Chester Thompson – drums