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All answers having "Musical instruments" as clue:

4 Character Answers:

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AXES

UKES



5 Character Answers:

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BANJO

FIFES

HARPS

LUTES

OBOES

ORGNS

REEDS

VIOLS



6 Character Answers:

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CELLOS

PIANOS

VIOLAS



7 Character Answers:

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CORNETS

GUITARS

SPINETS



8 Character Answers:

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MARIMBAS



9 Character Answers:

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BASSVIOLS

CALLIOPES

RECORDERS

TRIANGLES