Ruth Underwood (born Ruth Komanoff; May 23, 1946) is an American musician best known for playing xylophone, marimba, vibraphone, and other percussion instruments for Frank Zappa and his band The Mothers of Invention. She played for Zappa from 1968 until his death. She married fellow Zappa musician Ian Underwood.
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Zappa

200 Motels

Frank Zappa: The Broadcast Archives

Eat That Question: Frank Zappa in His Own Words

Classic Albums: Frank Zappa - Apostrophe (') Over-Nite Sensation

The True Story of Frank Zappa's 200 Motels

Frank Zappa & The Mothers: Roxy: The Movie

Frank Zappa: Cheaper Than Cheep
An American Dissident: un tributo a Frank Zappa

Video from Hell

Classic Albums: Frank Zappa & The Mothers Of Invention - Freak Out!

Frank Zappa: A Token Of His Extreme

Frank Zappa: Roxy, 1973

Frank Zappa: Opopoppa Stockholm, Sweden

Cheepnis
The Drummers of Frank Zappa Roundtable Discussion and Performance