refers to the high notes in the fourth octave on the piano. The fourth octave starts from the key C in the center of the piano, which is recorded as C4, and then goes up to D4 and E4. In short, each octave follows the CDEFGAB cycle. The four groups of tenors refer to G4-B4 in the fourth octave. This tenor zone is for boys, because the tenor zone for boys starts from G4, while the tenor zone for girls starts from C5.

Extended materials

Basic pianos have 4 groups of small characters and 5 groups of small characters.

standard piano has 88 keys, 52 white keys and 36 black keys.

*** is divided into 9 phonetic groups: big character group 2, big character group 1, big character group, small character group 1, small character group 2, small character group 3, small character group 4 and small character group 5.

to the right of the central C: small group 1 (the central C group), small group 2, small group 3, small group 4 and small group 5.

central c to the left: small group, big group, big one, big two. Except for the small five (a c) and the big two (a and b), every other group is the seven sounds of CDEFGAB. These seven sounds are called C(DO), D(RE), E(MI), F(FA), G(SOL), A(LA) and B(SI) from left to right.

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