The Musical Suspects

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Across
  1. 3. Where are we based?
  2. 4. The lowest part in harmonic music
  3. 5. A musical ensemble of singers
  4. 6. The second highest voice part in a 4-part chorus
  5. 9. Sometimes we sing without instrumental accompaniment
  6. 11. The highest vocal range of all voice types
  7. 12. At what time does the concert start?
  8. 13. On which day of the week do we rehearse?
  9. 14. The highest of the male voice types
Down
  1. 1. What day is 24 May 2013?
  2. 2. The ??????? Suspects
  3. 4. We sing everything from Bach to ???????
  4. 7. At what time does the concert end?
  5. 8. We are a close ??????? group
  6. 10. National ??????? Hall