Ruth Underwood, born Ruth Komanoff on May 23, 1946, is a celebrated musician known for her extraordinary work with Frank Zappa and The Mothers of Invention. From 1968 until Zappa's passing, she brought her unique talents on instruments like the xylophone and vibraphone to the stage and studio, helping to create some of Zappa's most innovative sounds. Collectors often seek out her standout performances in the 2013 documentary *Frank Zappa: A Token Of His Extreme*, which captures her remarkable musicianship and offers a rare glimpse into the avant-garde world of Zappa's music. Underwood's contributions to Zappa's discography make her a significant figure in the realm of physical media. Her work not only showcases her virtuosity but also represents an era of experimental music that defined a generation. For enthusiasts of vinyl and home video, her collaborations are essential additions, symbolizing the fusion of artistry and groundbreaking sound that Zappa championed. Collectors value these releases for their historical significance and the unique insights they offer into Zappa's creative genius.