atonal

/eɪˈtoʊnəl/
adjective
  1. Not written in any key or tonality; lacking a tonal center, used especially of music.
    • She found atonal melodies difficult to enjoy because they lacked a familiar tune.
    • Many 20th-century composers experimented with atonal music.
    • The composer's atonal piece used dissonant chords that surprised the audience.
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