Very Clever Music Puzzle

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Across
  1. 4. To play in a certain ______
  2. 5. Who does fine clef
  3. 6. Heart with Dots
  4. 7. Footsteps getting louder
  5. 9. Medium
  6. 10. The odd key
Down
  1. 1. Second Letter of the Alphabet
  2. 2. A liquid you need to survive
  3. 3. One Beat
  4. 4. The unit of time in music
  5. 5. BPM
  6. 6. Ode To Joy was composed by?
  7. 8. Playing multiple keys together is a?