Beginners can generally buy a 10 hole harmonica in C key first, such as TOMBO in Japan, HOHNER in Germany and HERING in Brazil. TOMBO suggested buying the C key of folk blues. HOHNER suggested buying a blues harp in C or a special 20. In the future, with the improvement of playing skills, we will consider choosing other commonly used songs. The quality of domestic harmonica is very unstable, and there is a big gap between domestic harmonica and foreign brands in terms of material selection, workmanship and after-sales service. You can buy a domestic harmonica with good quality and low price through careful selection, but if you don't want to try it, it is recommended not to buy it, because if you buy a harmonica with poor quality, it will probably hinder your study because of the quality problem of the harmonica.