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All answers having "Musical groups" as clue:

4 Character Answers:

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DUOS



5 Character Answers:

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BANDS

TRIOS



6 Character Answers:

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OCTETS



7 Character Answers:

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SEPTETS

SESTETS



8 Character Answers:

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CHORUSES

QUARTETS



9 Character Answers:

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ENSEMBLES

JAZZBANDS