A minor seventh
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The Am7 chord has the formula 1, b3, 5, b7 with notes A, C, E, G
Matching Scales: A MinorA DorianC MajorC MixolydianE MinorE PhrygianG MajorG Dorian
The minor seventh chord is commonly used in soul and R&B, among many other genres. The chord works well as the tonic in a minor progression, or as the 2nd degree in the classic ii-V-I jazz turnaround.