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At some point on a musical staff, you may see two dots placed on the 2nd and 3rd spaces, just before the bar line.
What does this tell the performer to do?
This is a repeat sign. It instructs the performer to either go back to the beginning of the piece of music and repeat it once or to go back to a location where the performer sees two dots in the same location on the staff but placed just after the bar line. This would mean to repeat to that location.