Musically speaking

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Across
  1. 2. The sousaphone is a cousin of this
  2. 3. Got a sidewalk, will play
  3. 4. What musicians strike
  4. 6. Neither's companion
  5. 7. Professional musicians get a lot of these
  6. 9. A set of tones that repeat every octave
  7. 11. The era of Brahms and Tchaikovsky
  8. 12. The first three notes just happen to be...
  9. 14. Half of a popular musical theater duo
  10. 15. He wanted help making the music of the night
  11. 17. What results when violins, a viola and cello hang out
  12. 18. 20th century composer known for quoting folk melodies
Down
  1. 1. It's called America's truly original music
  2. 2. You need long arms to play this
  3. 5. Primary school bands often produce this
  4. 8. He was miles ahead of this time
  5. 10. The scale you get when you start on the second note of a major scale
  6. 13. He saw the world through rose-colored glasses
  7. 16. Classical Gas brought his music to a whole new generation