Atonality is the absence of key or tonality in a musical piece. Here option C is the correct answer.
Lack of a primary or centre key around which music is structured The conventional method of pitch organisation, which establishes a tonic, or "home," pitch via keys, scales, triads, and associated chords, is not used in atonal music.
In general, music that deviates from tonal conventions is referred to as atonal music. These guidelines help to establish tonal hierarchies, or systems, in which some notes are more crucial to the song's overall sound than others. Atonality enthusiasts attempt to bend these conventions by giving each note a greater degree of importance.
Any musical work that departs from conventional Western standards of harmony, key, or mode is considered atonal music. Atonal music does not contain a core tone or tonal centre.
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