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Answer:

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 when sounded harmonically. ...

Explanation:

For example, C is adjacent to C♯; the interval between them is a semitone

Answer:

semitone is the distance between one sharp note (#)  or one flat note (♭).  it gives the music a harmonically sound.

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Explanation: