The pitch relationship between two musical tones. Expressed in "degree". Taking simple musical notation as an example, from 1 to 1 or from 2 to 2 is a degree, from 1 to 3 or 2 to 4 is a third, and from 1 to 5 is a fifth. Degree is a unit used to measure the auditory distance between sounds.

Beat is a unit of measurement of rhythm, which is a metaphor for regular progress.

In music, time is divided into equal basic units, and each unit is called a "beat" or a beat. The duration of a beat is represented by the duration of the note. The duration of a beat can be a quarter note (that is, a quarter note is a beat), a half note (a half note is a beat), or an eighth note. diaeresis (eighth note as one beat). The duration of a beat is a relative concept of time. For example, when the prescribed speed of the music is 60 beats per minute, each beat takes up one second, and half a beat is one-half second; when the prescribed speed is 120 beats per minute, time, each beat is half a second, and half a beat is a quarter of a second