Many thanks to FrankieHeck and Abide for test-solving and suggestions for improvement. Special shout-out to Joe Ross for technical support. I hope you enjoy!
Hint #1) There is an unusually high frequency of a certain letter in the grid. This letter is mentioned in the clue for 12-Down + 62-Down
Hint #2) "None shall sleep"... what happens if you ban all those Zs?
Hint #3) The 7 grid entries with double Z's in them become new words with the "ZZ" removed
Hint #4) You can find entries in the grid whose clues satisfy the 7 new words. For example, MUZZLES --> MULES and "Beasts of burden" is the clue for CAMELS that can also clue MULES
Hint #5) Extract the first letter of the 7 grid entries whose clues satisfy the 7 new words and read them in grid order (top to bottom)
Hint #6) The meta answer is the name of a composer
betterless bad at solving metas!