There is a saying of "hopscotch" in music scores, which refers to the last sentence of a paragraph and the last sentence of a repeated paragraph. The two paragraphs are the same melody, but the last sentence is different, so "a house" is used. , "二屋" to express the distinction;

The specific method is: use slender lines above the two final sentences to cover the entire melody, and fill in the number 1. or 2. at the break position in the middle. Indicates two different endings. It is for one house or two houses. Extended information

The predecessor of staff notation can be traced back to the Newham notation and measured notation in the Middle Ages. Newm notation uses horizontal lines as the standard and uses symbols to indicate the pitch of the notes, but does not show the length of the notes. This notation appeared in the European Catholic Church from the 7th century on. Initially, only one line was used to represent the F pitch. In the 11th century, it was gradually developed into four lines by Guido of Arezzo.

The pitches are specified as d, f, a, c, and the f money is drawn in red and the c line in yellow (later it became the origin of the treble and bass clefs in the staff). In the 13th century, someone used the fifth line, which became the predecessor of the staff. In the 16th century, the method of adding lines was introduced, which more complete the recording of pitch.

Baidu Encyclopedia-Music Score