Rhyme for repeated jump marks: Four vertical lines are divided into two sides, with two dots on each side. If you encounter it in a song, please sing it again. Or: The two brothers are the same length, and the two pairs of calves face each other. The two of them tell you to turn around and sing again. Music repeat notation is an omitted recording form adopted to save space in music scores and facilitate the writing of music scores. It is mainly divided into D.C. mark, D.S. mark, paragraph repeat mark and repeated skip mark. It is widely used and belongs to basic music theory.