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C7 Chord and CMaj7 (or CM7)
The chords C7 and CMaj7 (or CM7) are related, having the same triad base, C, E, and G, with one added note, B flat amd B, respectively. Here are the component notes:
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The C7 chord (C 7th) is comprised of these notes played simultaneously:
C E G B♭
The term “7th chord” always means that the 7th note of the scale is a flatted 7th.
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The chord CMaj7 (CM7 or C major 7th) is comprised of these notes played simultaneously:
C E G B
The term “major 7th chord” always means the 7th note of the scale is a natural 7th (not flatted).