Musical puzzle

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Across
  1. 3. Sequence of notes
  2. 5. Gradual increase in volume
  3. 7. High musical tone
  4. 9. Performance by one
  5. 11. High or low sound
  6. 13. Group of notes
  7. 15. Keyboard instrument
  8. 19. Group of singers
  9. 20. Stringed instrument
  10. 21. Higher in pitch
  11. 23. Unamplified sound
  12. 25. Dramatic vocal performance
  13. 29. Collection of songs
  14. 30. Main musical tune
  15. 31. Repeated section of a song
  16. 33. Musical sound unit
  17. 34. Music notation symbol
  18. 35. Brass instrument
  19. 39. Wind instrument
  20. 40. Set of five lines
Down
  1. 1. Performance by two
  2. 2. Interval of eight notes
  3. 4. Large ensemble
  4. 6. Percussion instrument
  5. 8. String instrument
  6. 10. Adjusting pitch
  7. 12. Speed of music
  8. 14. Blending of sounds
  9. 16. Lower in pitch
  10. 17. Gradual decrease in volume
  11. 18. Main part of a song
  12. 22. Sound booster
  13. 24. Writes music
  14. 26. Low musical tone
  15. 27. Song words
  16. 28. Leads the orchestra
  17. 32. Basic time unit
  18. 36. Pattern of beats
  19. 37. Slow, emotional song
  20. 38. Tonal center of music