Musical terms, composers and instruments

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Across
  1. 2. A group of singers
  2. 3. Among other things famous for "The four season"(Le quattro stagioni) [just last name]
  3. 6. A sequence of chords that brings an end to a phrase
  4. 8. Harsh, discordant, and lack of harmony. Also a chord that sounds incomplete until it resolves itself on a harmonious chord
  5. 13. A gradual increase in loudness in a piece of music
  6. 15. At a walking pace
  7. 16. The unit of musical rhythm
  8. 17. With each sound or note sharply detached or separated from the others
Down
  1. 1. Among other things Famous for "The magic flute" (Die Zauberflöte) [just last name]
  2. 4. A decrease in loudness
  3. 5. A symbol used in musical notation indicating to gradually quicken tempo
  4. 7. A symbol of musical notation indicating that the note should be prolonged beyond the normal duration its note value would indicate
  5. 9. A piece of music written for two vocalists or instrumentalists
  6. 10. A symbol that indicates to play loud
  7. 11. A symbol that indicates to play quiet
  8. 12. The distance in pitch between two notes
  9. 14. An indication to play a note with particular emphasis