Art's Birthday

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Across
  1. 4. Beethoven Symphony in E flat major
  2. 5. One half step higher
  3. 8. Dual advanced degree guy
  4. 9. A musical campsite
  5. 11. A sister instrument
  6. 12. C-E-G, for example
  7. 14. A magical Mozart instrument
  8. 17. Driver's license datum
  9. 18. Adagio or allegro
  10. 19. Perfect maker?
  11. 20. Keeps your self -driving car from crashing
  12. 22. Barber of opera
  13. 24. 'Grand' piece of furniture
Down
  1. 1. Your best opera partner
  2. 2. zero days is this one's goal
  3. 3. At least 8 hours of this is needed
  4. 5. A major is one, or a place to step on in the morning
  5. 6. Court great Ashe, or the subject of this puzzle
  6. 7. It may fill a hall
  7. 10. 'Cose Fan Tutte' composer
  8. 13. Like a clam?
  9. 14. Black key, maybe
  10. 15. Magnum _____
  11. 16. "_____ It", Michael Jackson song
  12. 17. Some feel the best piano
  13. 21. ______ at heart, Like the subject of this puzzle
  14. 23. Noted sci-fi novelist