What are the keys of the blues harmonica?

A 10 hole harmonica * * * has 12 tones, each tone is only different in pitch, and the arrangement of other scales is the same. Because of the different pitch, the feeling of bending sound in different tones is different. 10 hole harmonica 12 sound, the G sound is the lowest. The order from low to high is: G # G ABBBBC # C DBEF #F, the highest note is #F, and the above is the pitch arrangement of 12 harmonica. Some brands of harmonicas have several special timbres. To say it is special is actually to add some comments. Adding a note lower than G to a low key is generally called a low F, even a low E and a low D lower than the low F, and adding a note higher than #F to a high key is generally called H G, such as 14 and 12 in Tang Bo's folk blues.

It is recommended to buy a key or d key. The pitch of a key is lower than that of c, and the pitch of d key is higher than that of C.