How do repeat signs shape the structure of a musical piece?

In musical notation, repeat signs are essential tools that shape the structure of a composition by indicating that a specific passage of music should be performed more than once. By directing the musician to return to a previous point in the score, these signs help establish familiarity and thematic consistency within a piece.1

Functionally, these markings act as structural markers that define the boundaries of a repeated section. When encountered, they instruct the performer to cycle back through the indicated measures, effectively extending the duration of the music and reinforcing its internal patterns without requiring the composer to write out the same notes repeatedly. This use of repetition is a fundamental technique for creating balance, rhythm, and recognizable form in musical works.21