Bits of musical compositions (6)
I believe the answer is:
pieces
I believe this clue is a double definition.
'bits' is the first definition.
(I know this)
'musical compositions' is the second definition.
('piece' can be a synonym of 'musical composition')
'of' is the link.
(Other definitions for pieces that I've seen before include "Bits < of sandwiches" , "Fragments" , "barrels of wine" , "Bits, portions" , "Portions, parts" .)