1. 1984 - Guitar solos "Sharleena" and "Stevie's Spanking" on Frank Zappa's Them or Us
  2. 1984 - Guitar on Frank Zappa's You Can't Do That on Stage Anymore, Vol. 3 (album) on "Sharleena"
  3. 1985 - Vocals on Frank Zappa's Frank Zappa Meets the Mothers of Prevention
  4. 1986 - Guitar solo on "Whipping Post" on Frank Zappa's Does Humor Belong in Music?'
  5. 1988 - Winger on "Purple Haze"
  6. 1989 - With sister Moon Unit, contributed the track "(In Love) With You Gumby" to the novelty album Gumby
  7. 1990 - Opening and outro solos on Extreme's Pornograffitti on the song "He-Man Woman Hater"
  8. 1992 - Lead guitar on "Diva Fever" on Spinal Tap's Break Like the Wind
  9. 1993 - Lead guitar on "Dirty Love" and "Chunga's Revenge" on Zappa's Universe tribute
  10. 1994 - Barks on the track "Waffenspiel" on Frank Zappa's Civilization Phaze III
  11. 1997 - Guitar solo on Pat Boone's cover of "Smoke on the Water" (the No More Mr. Nice Guy album)
  12. 2000 - Guitar on Dixie Dregs's California Screamin CD performing "Peaches en Regalia"
  13. 2001 - 911, on "Top of the World"
  14. 2003 - "Weird Al" Yankovic's Poodle Hat album, on "Genius In France"
  15. 2006 - Lead guitar on "Chunga's Revenge" and "Bavarian Sunset" on Frank Zappa's Trance-Fusion
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