No need. Guankou can be said to be a kind of tongue twister. Because it is very rhythmic, it can also be performed through Allegro, which is a way for us to practice pronunciation and rhythm. You can practice Guankou through Allegro or by playing it to the rhythm of Guankou itself. There is no need to use any background music. Guankou Shibachou itself has a unique rhythm, and using other background music is not as good as using its own rhythm.