Across:
   1. TV show fails miserably, is dumped (3)
   3. Putting on high flying GI or such performance (10)
  10. Billy with rhythmic keys used to help rest onward (7)
  11. Idea to use 27 for quiet performance (7)
  12. Musical sampling inevitable (5)
  13. Musical effect, one working in great number (8)
  15. Musical instrument originally in C natural (7)
  16. Retreat used for 27 11? (3 4)
  18. Dad mixed syrup and sedge (7)
  21. Band performing able set (7)
  23. Gets ready for 4 paperers (8)
  25. Put off "Bambi" perhaps with inclusion of hit finale (5)
  26. A sung piece stoked her coal (7)
  27. Marijuana, for embracing love, from right place for the 21 6 11 (7)
  28. Musician who uses much hot air repeatedly changing large to small (10)
  29. Fear no loud organ (3)
Down:
   1. 21 company with copper pals all over (5 5)
   2. see 7
   4. Sort I mostly call "nut"? (7)
   5. Cork gin, drunk is getting lively! (7)
   6. Regularly learn riffs backwards, the ultimate competitive effort! (5)
   7,2. I'm experiencing sensation of a number on 22 (1'2 3 1 7)
   8,26. King, lost, blew 16 to obtain ride (3 3)
   9. Rinse tar out of porous device (8)
  14. Absurdly perky, crass erection (10)
  17. 16 quarter-acre section, which may lead to 27 (8)
  19. Alan, recording 21's 27 11, had no time for parts on sung piece (7)
  20. Operator working after burst of energy (7)
  21. Writers hang around street eateries (7)
  22. 21 hit production has pieces omitted (3 2 2)
  24. Musical instrument, originally in A, placed in post office (5)
  26. see 8