Crossword Genius

Type of music lacking a single key (6)

Ross

I believe the answer is:

atonal

(Other definitions for atonal that I've seen before include "Musically, having no established key" , "(Of music) lacking key" , "(Music) having no established key" , "Unaccented" , "Not in a key (mus.)" .)

I've seen this clue in The Guardian.
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