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All answers having "Musical instrument" as clue:

3 Character Answers:

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AXE

SAW

SAX

UKE



4 Character Answers:

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AMEN

DRUM

FIFE

HARP

HORN

LUTE

LYRE

OBOE

REED

SONG

TUBA

VIOL



5 Character Answers:

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AEGIS

AMATI

BANJO

BELLS

BUGLE

CELLO

FHORN

FLUTE

KAZOO

ORGAN

PIANO

VIOLA



6 Character Answers:

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CORNET

CYMBAL

FIDDLE

GUITAR

SPINET



7 Character Answers:

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BAGPIPE

CELESTA

COTERIE

HAUTBOY

MARIMBA

OCARINA

PICCOLO



8 Character Answers:

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CALLIOPE

CLARINET

JEWSHARP

KEYBOARD

MANDOLIN

MELODEON

RECORDER



9 Character Answers:

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ACCORDION

BABYGRAND

SAXOPHONE

XYLOPHONE



10 Character Answers:

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CONCERTINA



11 Character Answers:

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BARRELORGAN



12 Character Answers:

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UPRIGHTPIANO



13 Character Answers:

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ELECTRICPIANO