C major scale

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C major notes: C D E F G A B

3-notes chords built on C major scale:

1. C Major: C E G
2. D Minor: D F A
3. E Minor: E G B
4. F Major: F A C
5. G Major: G B D
6. A Minor: A C E
7. B Diminished: B D F

4-notes chords built on C major scale:

1. C Major 7: C E G B
2. D Minor 7: D F A C
3. E Minor 7: E G B D
4. F Major 7: F A C E
5. G Dominant 7: G B D F
6. A Minor 7: A C E G
7. B Half Diminished 7: B D F A