sigma music things

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Across
  1. 5. a note worth 4 beats
  2. 7. Segment of time given a number of beats.
  3. 8. Instrument played by striking keys
  4. 12. a group of string instruments
  5. 15. a sequence of notes going up or down.
  6. 17. Levels of sound in music.
  7. 20. a note worth one beat
Down
  1. 1. to play medium
  2. 2. Printed form of music.
  3. 3. half step higher
  4. 4. The speed music is played.
  5. 6. To play loudly
  6. 9. half step lower
  7. 10. adjusting an instrument to produce the desired note.
  8. 11. a group of brass wood wind percussion.
  9. 13. a note worth two beats
  10. 14. Playing a note louder than other notes.
  11. 16. 3 or more notes played at the same time.
  12. 18. Slow tempo
  13. 19. Central scale of notes a song is built on.