The Seventh

MAJOR 7
Tones: 1, 3, 5, 7
Notes: C, E, G, B

MINOR 7
Tones: 1, b3, 5, b7
Notes: C, Eb, G, Bb

DOMINANT 7 (MIXOLYDIAN)
Tones: 1, 3, 5, b7
Notes: C, E, G, Bb