A semitone, also called a half step or a half tone, is the smallest musical interval commonly used in Western tonal music,and it is considered the most dissonant. The most commonly written form of this interval is the minor second, notated using two adjacent letter names (e.g. C and D?), but the augmented unison is also used, both notes having the same letter-name, with one of the notes being inflected by an accidental (e.g. C and C?).

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