Answer:
Step-by-step explanation:
It is likely that the bracketed part represents a measure in music notation. In sheet music, measures are used to visually organize and group musical rhythms and melodies. The vertical lines, or bar lines, that are used to separate measures also help to indicate the pulse or beat of the music. The use of a bracket to enclose a group of measures can indicate that all of the measures within the bracket should be played as a unit, often with a specific musical structure or form. The bracket can also be used to visually group measures for purposes of repeat notation, where the music within the bracket is to be played more than once.