Musical pets? (4)

I believe the answer is:

cats

This clue is a double definition.

'musical' is the first definition.
(Andrew Lloyd Webber musical)

'pets' is the second definition.
(cat is a type of pet)

(Other definitions for cats that I've seen before include "Musical; animals" , "Siamese, Persian etc" , "Domestic pets" , "Some 6 Downs" , "Jaguars, say" .)

I've seen this clue in the Sydney Morning Herald, The Daily Express and The Mirror.

Want a hint initially instead of a full solution? Install my app