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All answers having "Piece of music" as clue:

3 Character Answers:

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RAG



4 Character Answers:

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ARIA

DUET

HYMN

NOTE

OPUS

TRIO

TUNE



5 Character Answers:

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CHANT

CHORD

CURIE

ETUDE

LARGO

MARCH

MOTET

NONET

OCTET

RONDO

SHEET

VALSE

VENUS

WALTZ



6 Character Answers:

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SONATA



7 Character Answers:

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CANTATA

ROBOTIC

RONDEAU



8 Character Answers:

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ORATORIO

OVERTURE

SERENADE

SERENATA

SONATINA