Music has 8 tones, and the second Chinese character for 2 is written in 廻. 1do, 2re, 3mi, 4fa, 5so, 6Ia, 7xi. This is a simple notation method in music. The seven basic musical notation refers to a simple notation method. There are two types of notation: letter notation and numerical notation. It originated in France in the 18th century and was improved by the Germans. This resulted in what it looks like today. That is to say, it is pronounced as Duo, Xiao, Mi, Fa, Zhu, La and Xi. The basic explanation of the 8th interval in music is that there are eight intervals between two notes, and their note names and roll calls are the same.