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.

200 Motels
1971 | 1h 38m | RATING: 5.2/10

Frank Zappa: The Dub Room Special!
1982 | 1h 32m | RATING: 6.4/10

Cheepnis
2014 | 0h 10m | RATING: 0.0/10

The True Story of Frank Zappa's 200 Motels
1988 | 0h 59m | RATING: 7.3/10

Video from Hell
1987 | 1h 0m | RATING: 7.3/10