Unable to discern differences in musical pitch (4-4)

I believe the answer is:

tone-deaf

(Other definitions for tone-deaf that I've seen before include "Not able to distinguish pitches" , "Unable to distinguish variations in musical pitch" , "Fade note? (anag.)" , "Unable to discriminate between musical notes" , "Unable to perceive differences of musical pitch" .)

I've seen this clue in The Times.

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