1. A number in the musical notation represents a sound, for example, "1" represents "Do", etc., and the readings of 1, 2, 3, 4, 5, 6, and 7 are: do, re, mi, fa, so, la, si (Duo, Lai, Mi, Fa, Shuo, La, Xi)

2. The underline in the musical notation indicates the corresponding rhythm. One of the Underlines represent half a beat, two lines represent a quarter beat, three lines represent an eighth of a beat, and those without represent a complete beat?. There is no limit to the length of a beat, it can be 1 second? It can be 2 seconds or half a second. As shown in the picture below, "7" and "5" are played for half a beat each, and together they are one beat.

3. The rest indicates a pause, that is, playing a soundless note.

4. As shown in the picture above, the two "3"s are connected by an arc. If there is no arc, it means half a beat and two beats respectively; and if there is an arc, it means that the two notes only need to be played once, that is, a half-beat "3" and a two-beat "3" are played together into one Two and a half beats of "3". (Note that this type of arc is only used between two identical notes)