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Common accidentals
Accidentals modify the pitch of the notes that follow them on the same staff position within a measure, unless cancelled by an additional accidental.
Flat Lowers the pitch of a note by one semitone. |
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Sharp Raises the pitch of a note by one semitone. |
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Natural Cancels a previous accidental, or modifies the pitch of a sharp or flat as defined by the prevailing key signature (such as F-sharp in the key of G major, for example). |
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Double flat Lowers the pitch of a note by two chromatic semitones. Usually used when the note to be modified is already flatted by the key signature. |
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Double sharp Raises the pitch of a note by two chromatic semitones. Usually used when the note to be modified is already sharped by the key signature. |