Sounds of music

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Across
  1. 5. The highest female singing voice:
  2. 7. A steady low background sound:
  3. 10. A slow, emotional song:
  4. 13. A pleasing combination of musical notes:
  5. 15. Soft sound made by leaves or gentle wind:
  6. 18. Repeated section in music:
  7. 19. A musical tone from a bell or piano:
  8. 20. Singing softly and smoothly:
Down
  1. 1. Singing without instrumental accompaniment:
  2. 2. Unpleasant mixture of sounds:
  3. 3. The lowest male voice type:
  4. 4. Group of singers singing together:
  5. 6. The rise and fall in pitch during singing:
  6. 8. Sound produced by blowing into an instrument:
  7. 9. High-pitched unpleasant sound from a violin:
  8. 11. The speed or beat of music:
  9. 12. A pause or silence in music:
  10. 14. A sudden loud sound, often from percussion:
  11. 16. Playing a string instrument softly with fingers:
  12. 17. A sound that bounces back: