Key signature

The group of sharp or flat symbols placed immediately after the clef symbol on the stave at the beginning of a piece of music, and at the beginning of every subsequent stave, to indicate the key. These sharps or flats are presumed to be active for the duration of the piece or section, unless cancelled, either temporarily (for one bar or part of the current bar) by an accidental) or more permanently, by the placing of a new key signature.

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