In music, tones are ornamental tones that start from the main note and fluctuate rapidly upward or downward between adjacent notes. Divided into upper Boeing and lower Boeing. The ascending tone travels from the tonic note to the note above the tonic note and back to the tonic note. The down tone is the progression from the main note to the note below the main note, and then back to the main note. The duration of the main note occupied by the ascending tone and the descending tone is the same, both of which are 1/4 of the total duration