For beginners, there is no essential difference in sound quality between missing corners and rounded corners. (1) Round corner guitars are relatively easy to produce, because there is no need to heat and bend the panel of the box, but the absent corner guitar has more of this process, so many people will find that in the same level of folk guitar, the absent corner guitar is more expensive than the round corner guitar, which is also a normal phenomenon. The lack of angle guitar has a bending part on the box, which easily leads to some changes in sound quality. Usually the sound of rounded corner guitar is more mellow and plump than that of lacking corner guitar. The main reason is the structure. The box of the round corner ballad guitar is larger, and it is easy to produce good sound quality, and the sound loudness will be correspondingly larger. (3) When buying ballad guitars, just look for a suitable shape, because to beginners, there is no essential difference in sound quality. Only when a certain amount of technology has been accumulated, can we know how to better choose the favorite instruments.