Tiny fragments of piano pieces (9)
I believe the answer is:
particles
'piano pieces' is the definition.
'particles' can be an answer for 'pieces' (I have seen 'Tiny pieces ' mean 'particles' so perhaps 'pieces' could also mean 'particles'). I'm not certain of the 'piano' bit.
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for particles that I've seen before include "Minute pieces of matter" , "Scraps" , "Tiny pieces" .)