Crossword Genius

Like some music that's challenging to sing (6)

Ross

I believe the answer is:

atonal

(Other definitions for atonal that I've seen before include "(Of music) without key" , "Keyless" , "(Of music) not in any key or mode" , "An alto (anag) - without a fixed key" , "(Music) having no established key" .)

I've seen this clue in The New York Times.
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