Courtesy key signature
A musical notation provided by the composer (or music editor) to warn the performer that the key signature will be changing on the next staff. This notation is always placed after the last barline on a staff when a new key signature begins immediately on the following staff. In this situation, the end of the staff or system would be open with no barline and a double bar should be placed before the courtesy key signature at the end of the staff or system.
Courtesy Key Signature
More about the staff - More about the accidentals
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