Tajemniczy Dysk to składankowy album Franka Zappy z roku 1998, zawierający nagrania z wczesnych lat kariery, konkretnie 1[zasłonięte]962-19 (tylko jeden utwór, The Story Of Willie The Pimp, pochodzi z 1972 roku). W kilku utworach, podobnie jak na płycie The Lost Episodes, śpiewa Captain Beefheart.

1. Theme From 'Run Home Slow'

2. Original Duke Of Prunes

3. Opening Night Party At 'Studio Z' (College)

4. The Village Inn

5. Steal Away

6. I Was A Teenage Malt Shop

7. The Birth Of Captain Beefheart

8. Metal Man Has Won His Wings

9. Power Trio Segment From The Saints 'N Sinners

10. Bossa Nova Pervertamento

11. Excerpt From the Uncle Frankie Show

12. Charva

13. Speed-Freak Boogie

14. Original Mothers At the Broadside (Pomona)

15. Party Scene From 'Mondo Hollywood'

16. Original Mothers Rehearsal

17. How Could I Be Such A Fool?

18. Band Introductions At The Fillmore West

19. Plastic People

20. Original Mothers At The Fillmore East

21. Harry You're A Beast

22. Don Interrupts

23. Piece One

24. Jim/Roy

25. Piece Two

26. Agency Man

27. Agency Man (Studio Version)

28. Lecture From Festival Hall Show

29. Wedding Dress Song/The Handsome Cabin Boy

30. Skweezit Skweezit Skweezit

31. The Story Of Willie The Pimp

32. Black Beauty

33. Chucha

34. Mothers At KPFK

35. Harmonica Fun