"Grand" music (5)
I believe the answer is:
opera
'grand music' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for opera that I've seen before include "Eg, Der Rosenkavalier" , "eg Peter Grimes" , "Macbeth, say" , "could be soap" , "some theatrics" .)