Ruth Underwood played on these albums or songs:

• 200 Motels (orchestra drum set)
• Over-Nite Sensation (marimba, vibes, percussion)
• Apostrophe(') (percussion)
• Roxy & Elsewhere (percussion)
• One Size Fits All (vibes, marimba, percussion)
• Zoot Allures (synthesizer, marimba)
• Zappa In New York (percussion, synthesizer)
• Studio Tan - RDNZL (percussion, synthesizer)
• Sleep Dirt (percussion)
• You Can't Do That On Stage Anymore vol 1 - Babbette (percussion)
• You Can't Do That On Stage Anymore vol 1 - I'm The Slime (percussion)
• You Can't Do That On Stage Anymore vol 1 - Big Swifty (percussion)
• You Can't Do That On Stage Anymore vol 2 (percussion)
• You Can't Do That On Stage Anymore vol 3 - Dickie's Such An Asshole (percussion)
• You Can't Do That On Stage Anymore vol 4 - Montana (percussion)
• You Can't Do That On Stage Anymore vol 4 - Smell My Beard (percussion)
• You Can't Do That On Stage Anymore vol 4 - The Booger Man (percussion)
• You Can't Do That On Stage Anymore vol 6 - Farther O'Blivion (percussion)
• You Can't Do That On Stage Anymore vol 6 - Black Napkins (percussion)
• The Lost Episodes - Kung Fu (percussion)
• The Lost Episodes - RDNZL (percussion)
• The Lost Episodes - Inca Roads (percussion)
• Läther - Re-gyptian Strut (percussion)
• Läther - The Legend Of The Illinois Enema Bandit (percussion, synthesizer)
• Läther - RDNZL (percussion, synthesizer)
• Läther - The Black Page #1 (percussion, synthesizer)
• Läther - Big Leg Emma (percussion, synthesizer)
• Läther - Punky's Whips (percussion, synthesizer)
• Läther - Flambé (percussion)
• Läther - The Purple Lagoon (percussion, synthesizer)
• Läther - Läther (percussion, synthesizer)
• Läther - Spider Of Destiny (percussion)
• Läther - Titties 'n Beer (percussion, synthesizer)
• Läther - Regyptian Strut (percussion)
• Läther - Time Is Money (percussion, synthesizer)