Music tones (5)

I believe the answer is:

blues

This clue is a double definition.

'music' is the first definition.
(blues is a kind of music)

'tones' is the second definition.
(blue colours or tones)

(Other definitions for blues that I've seen before include "Type of American folksong" , "Melancholic music of black American folk origin" , "Feeling of sadness or depression" , "Conservatives" , "Jazz classic (2,5,5) - See 9" .)

I've seen this clue in The Guardian.

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