What does "Dal Segno" (D.S.) mean in music?

"Dal Segno" (D.S.) is an instruction used in sheet music that directs the performer to return to a specific sign, which is often marked with the symbol "S" or "D.S." This allows for certain sections of a piece to be repeated, creating a musical structure that enhances the overall composition.

The importance of this instruction lies in its ability to facilitate varying repetitions without needing to write out entire passages again, which can simplify the notation and encourage more fluid performance. By allowing musicians to transition back to designated points marked by a "D.S.," composers can create richer musical experiences and maintain thematic coherence throughout their works. This aspect of musical notation is fundamental in helping performers navigate complex scores efficiently.