On the piano keyboard, the sound group near the middle is a small sound group, so people call this small sound group C the central C, which is named because it is located in the center of the piano and music system.
People divide the sounds in a series into several groups. The sound group in the central position in the phonetic sequence (that is, the seven sounds starting from the central C in keyboard instruments such as piano and electronic organ) is called the minor group, and the sounds twice, twice and thrice higher than the minor group are called the minor group, minor group, minor group and minor group respectively.
The small group is the most central group of the piano, and the c of this group is called the central C.
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HighC is double one, which means to add 2 points to 1 in c key. Hic is recognized as the tenor limit, male restricted area. It is also the most important touchstone of all excellent tenors and the strength standard of tenors. The biggest reason is that hic is not sustainable.
All the tones from any C (including this C) to its adjacent next C (excluding this C) in the ascending sequence and the relationship between the tones constitute a sound group. According to this regulation, a sound group has 12 tones from C to b*** and 12 semitones. Of course, these twelve chromatic relations are only basic relations, and the relations between other sounds can also be produced by these basic relations.
As usual, you don't need to consider the sound group when you sing the score by name, because the pitch itself already reflects the sound group. But in other cases, when talking about specific sounds, we must indicate which group it is, such as fa in the big group and la in the small group.
References:
Baidu encyclopedia-central c