Music!!!

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Across
  1. 4. - The sound of 2 or more notes heard simultaneously.
  2. 5. - The most famous instrument
  3. 8. - Type of way to sing
  4. 10. - The least famous instrument
Down
  1. 1. - A performance of a multipart musical work by unaccompanied voices
  2. 2. - The act of producing musical sounds with the voice
  3. 3. - When you sing in or as a group
  4. 6. - A device for producing a musical sound
  5. 7. - The most popular genre
  6. 9. - The least popular type of music