The simplified musical notation is marked with Arabic numerals. If there are no rising and falling symbols, the corresponding number is 1=do 2=er. By analogy, do is under the first capital letter of the piano trademark, and the white on the lower left of the two black keys Key, that one is called middle C = English name, Arabic name is 1, roll call: do.
The piano keyboard is composed of black keys and white keys, with a total of 88 keys (a few pianos only have 85 keys). There are 36 black keys and 52 white keys. The black keys are in groups of two and three. The entire keyboard is basically composed of the seven Arabic numeral tones "1234567" located on the white key of "Center 1 (C)", also called notes.
Extended information:
(1) The center "1" is located near the keyhole on the piano keyboard cover; the white key to the left of the black keys in a group of two is the center " 1". No matter what, this central "1" must be remembered. The other six tones are arranged sequentially to the right.
(2) There are no black keys between the white key and 1, 3 and 4. There are black keys between the remaining 1 and 2; 2 and 3; 4 and 5; 5 and 6; 6 and 7. key.
Baidu Encyclopedia-Piano