Crossword Genius

Music having no established key (6)

Ross

I believe the answer is:

atonal

(Other definitions for atonal that I've seen before include "(Of music) without key" , "Lacking traditional musical tone structure" , "(Of music) not in any key or mode" , "Not in a key (mus.)" , "Unaccented" .)

I've seen this clue in The Telegraph.
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