1. Decorative sound is the decoration of melodic sound, which plays a role in embellishing the melody and is very important for shaping the musical image. There are many kinds of decorative sounds, the most common of which are leaning sound, Boeing, cyclotron sound and vibrato.
2. In the lyrics of folk songs, in addition to the positive words that directly express the ideological content of the song, some set-off words composed of modal particles, pictophonetic words, homophonic words or titles are interspersed for the complete performance of the song. When singing with the positive words, the lining words show distinct emotions and become an inseparable part of the whole song.