Some tracks on a tape and a work by Mozart? (6)
I believe the answer is:
sonata
'a work by mozart?' is the definition.
(Mozart wrote several sonatas)
'some tracks on a tape' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'SONATA' is hidden within 'tracks on a tape'.
'and' is the link.
(Other definitions for sonata that I've seen before include "Music to play (not sing)" , "Musical composition for one or two instruments" , "Musical piece" , "Piece of music for solo piano" , "Sat on a kind of composition" .)