Did you find the words...?

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Across
  1. 3. The original name for the king of instruments.
  2. 4. An important note in a tonic triad that you can change to sound happy, or sad.
  3. 7. You can play them already.
  4. 8. You make rhythm with a...?
  5. 10. Low C to high C is an...?
  6. 12. A group of musicians playing and singing together.
  7. 13. A strong and stable note in a chord.
  8. 15. A large group of players.
  9. 18. This key sounds happy.
  10. 19. Mozart composed this genre (type) of music.
  11. 21. Special numbers for notes in a scale.
Down
  1. 1. Has six strings.
  2. 2. It might sound sad or scary.
  3. 5. What you play to make music.
  4. 6. Fortissimo, mezzo piano, forte, are all...?
  5. 9. Popular in Hawaii.
  6. 11. The first note of a scale.
  7. 14. C + E + G are the notes in C major tonic...?
  8. 16. Group of singers.
  9. 17. ...and Roll!
  10. 20. A series of notes put in order.