1, if 8 is recorded on the top of the note, it means that the note needs to play (sing) 8 degrees, and if 8 is recorded on the bottom of the note, it means that the note needs to play (sing) 8 degrees. If there is a dotted line after 8, it means that all the notes in the dotted line need to be raised or lowered by 8 degrees to play (sing). 2. The number at the top of the first bar at the beginning of each line of music indicates which bar it is. If 8 appears, it means that this section is the eighth section (this marking method is generally used in staff notation, but rarely used in notation). 3. Pauses of more than two bars can be marked with a long pause "8" (there is a short horizontal line between two short vertical lines), and the number on the symbol indicates the number of bars to be paused.