1. C Major (C Major), in music terms, is a natural major key of music starting with the C note. The composed notes are CDEFGAB, which is a key without sharps and flats.

2. D major is a major key based on the D (re) sound. It is called D major in English and is composed of D, E, #F, G, A, B, and #C. The key signature has two sharps, the relative minor is B minor and the parallel minor is D minor.

3. E major is a major key based on the E note, consisting of E, F?, G?, A, B, C?, D? and E. The key signature has four sharps. .

4. F natural major is a major key based on the F note, consisting of F, G, A, ?B, C, D, E and F. The key signature has a flat.

5. G Major is a major mode with G as the central note. The parallel minor is E minor, which is counted as a sharp in the staff.

Extended information:

In modern European music theory, the reason why the key area is represented by the key signature is because the European key area concept is often expressed on the keyboard and staff through it. The reason is to grasp the form of expression. The same natural seven-note scale, when the player selects different temperaments from the twelve temperaments to form different key ranges, will appear in different key selection methods on the keyboard.

Since the notation of black keys on the staff is by adding # or b in front of the notes of the white key positions, several black keys included in the key range are also represented on the staff. Represented by a number of # or b signs, these rising and falling marks are written on the left end of each line of the staff and on the right side of the clef, becoming a symbol of the key range used in the music.

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