Why are piano scores expressed in English letters?

These are the note names, and the corresponding roll calls are: C-1 D-2 E-3 F-4 G-5 A-6 B-7

Piano 1 ***There are 88 keys, which means that a sound will appear repeatedly in different sound areas, either high or low. If these 7 letters are not enough to display the pitch of each sound, then these sounds will be lowered. There are 9 sound groups to the high score, namely: 2 groups of large characters, 1 group of large characters, group of large characters, group of small characters, 1 group of small characters, 2 groups of small characters, 3 groups of small characters, 4 groups of small characters, and 5 groups of small characters. Take the C sound as an example. The middle C is located in group 1 of small characters. Its accurate mark is c?, which is composed of the lowercase letter c, the Arabic numeral 1 in the upper right corner, and the marks of groups 1-5 of small characters are all by analogy. The C in the group of large characters How to mark it? "C" consists of a capital letter C with the Arabic numeral 1 in the lower right corner.

?

I will take the sound A as an example below, because there is only one sound c5 in the 5 groups of small characters and can be ignored. Each of the other groups has the sound A, from lowest to highest: : A2 A1 A a a? a? a? a4 (Due to the input method, all the numbers on the right are not displayed correctly. The big characters are in the lower right corner, and the small characters are in the upper right corner. This is common sense knowledge, don’t make a mistake. Yes, it will make people laugh)

That’s all the common sense about note names and roll calls. If you don’t understand anything, you can continue to leave a message. I hope it will satisfy you