We're all in this together!

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Across
  1. 4. "Bright, light" violinist
  2. 7. Soccer fan #2?
  3. 9. Sibling who sometimes waltzes?
  4. 10. Violinist who prefers not to their disclose their planet of origin
  5. 12. Telemannster #4
  6. 13. Cellist with 7 consonants in their last name
  7. 15. Waltzing eternally?
  8. 17. Soccer fan #1?
  9. 18. Let's go!!!
  10. 20. Passera quartet violist
  11. 21. Telemannster #3
Down
  1. 1. Telemannster #1
  2. 2. Wrote the piece for our world premiere
  3. 3. Telemannster #2
  4. 5. Passera quartet cellist
  5. 6. This is just a little icebreaker!
  6. 8. Hier ist ____
  7. 11. Violinist from the moon
  8. 14. Sibling who sometimes waltzes?
  9. 16. Pianist/gymnast extraordinaire
  10. 19. Resident German language expert
  11. 20. "Are you listening..now..?"