Music is divided into 7 keys: C major, D major, E-flat major, F major, G-flat major, A-flat major, and B-flat major.

1. C major

C major (C Major) is a natural major key of music that starts with the C note. It consists of C, D, E, and F. , G, A, B, is a key without sharps and flats.

2. D major

D major is a major key based on the D (re) sound, and is called D major in English. It consists 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-flat major

E-flat major is a major mode with E-flat as do. Note names have a fixed position on the keyboard and are immutable. And the roll call can change according to the key. For example, in the key of C major, sing the C note as do?, the D note as re, and so on. In the key of E flat major, just sing E flat as do.

4. F major

F natural major is a major key based on the F note, consisting of F and G , A, B, C, D, E and F. The key signature has a flat. F natural major is a major key based on the F note and consists of F, G, A, ?B, C, D, E and F. The key signature has a flat. The relative minor is D minor and the parallel minor is F minor. The characteristic of a major key is that there is a major third relationship between the first and third notes.

5. G-flat major

All the notes in G-flat major are lowered by a semitone. In order of note names, they are G flat, A flat, B flat, B flat, D flat, E flat, F, G flat. Just make the SI flat above into a major key, and then ascend 3 white keys: C, D, E. ?E is the third ascendant of ?B, so the key name is B flat major and the key is E flat. In this way, we get 7 descended major keys: F major, B major, E major, A major, D major, G major, and C major.

6. A flat major

A flat major refers to a key with A flat as the main note (singing do), and the scales are: A flat (do) B flat (re) C (mi) D flat (fa) E flat (so) F (la) G (si) A flat (do), the one in the brackets is the roll call.

7. B-flat major

B-flat major has two flats, followed by two flats: 7 (Ti) and 3 (Mi). ?The key is the fixed height of the music, and the key signature is the mark of the key. It is written at the beginning of each line of staff. The sharp and flat marks after the clef are the key signature.

Baidu Encyclopedia-Twenty-Four Major Keys

Baidu Encyclopedia-Major Key

Baidu Encyclopedia-Septatonic Scale