The number of musicians

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Across
  1. 1. two people, especially two singers, musicians, or other performers
  2. 4. a group of four people who play musical instruments or sing as a group
  3. 6. a group of nine people or things, especially musicians.
  4. 7. a group of six musicians or singers who play or sing together, or a piece of music for six players or singers
Down
  1. 2. a group of eight singers or musicians performing together
  2. 3. a group of three people or things
  3. 4. a group of five people who play musical instruments or sing as a group
  4. 5. seven people who play musical instruments or sing as a group, or a piece of music written for seven people