Simplified musical notation is a notation method that uses 7 Arabic numerals to represent the 7 basic tones in the music score.

These seven basic tones are represented by 1, 2, 3, 4, 5, 6, and 7 respectively, also known as "roll call". A beautiful piece of music cannot be expressed by just seven basic tones. Therefore, in simplified musical notation, dots are added above and below the basic sounds to represent different pitches.

In addition, C, D, E, F, G, A, and B are also used to represent the "note names" of the seven notes in the musical notation. The pitch of each note name is fixed, while the pitch of the solfeggio varies according to the key. The so-called tune is used to specify the standard height of the tune of a piece of music. Each piece of music is marked with a key signature in the upper left corner. Such as "1=C", "1=D", etc. "1=C" means that the "C" on the keyboard is used as the "1" sound, that is, the 1 sound is sung as high as the C sound, and other sounds are based on this sound as the starting point, which is called the C key.

In simplified musical notation, notes of various durations are also used to represent the length of the sound. The short horizontal line added to the right of the note is called a value-added line. A value-added line increases the value of a quarter note. The horizontal line added under the note is called a penalty. A penalty line reduces the value of a thick note by half.

In addition, the symbol "O" is also used in simplified musical notation to represent rests, which serve as pauses and breath exchanges. Use the mark "·" to represent dotted notes; use the arc "⌒" to represent connecting lines; use the bar line "|" between bars to represent the beat of music, etc.