Variety music (6)

I believe the answer is:

strain

This clue is a double definition.

'variety' is the first definition.
(synonyms)

'music' is the second definition.
(I know that strain is a type of vocal music)

(Other definitions for strain that I've seen before include "making a great demand on the emotions?" , "Stretch or exert to the utmost" , "Struggle" , "Filter the stress" , "Try too hard" .)

I've seen this clue in the Evening Standard.

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