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Biography
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.
Filmography7 titles

Classic Albums
1997as Self
1997as Self

Eat That Question: Frank Zappa in His Own Words
2016as Self (archive footage)
2016as Self (archive footage)

Zappa
2020as Self - Played with Zappa 1967-1976
2020as Self - Played with Zappa 1967-1976

Roxy: The Movie
2015as Herself
2015as Herself

Classic Albums: Frank Zappa - Apostrophe (') Over-Nite Sensation
2007as Self
2007as Self

Frank Zappa: A Token Of His Extreme
2013as Herself
2013as Herself

200 Motels
1971as Fake Drummer
1971as Fake Drummer