About the Cm7 chord
To play C minor 7th, use the first shape above. Use your index finger to barre the 3rd fret across the G, C, E, and A strings. Strum all four strings and check that each one rings cleanly.
Root
C
Quality
Minor 7th
Notes
C · Eb · G · Bb
How the Cm7 chord works
C
Root(1)
The home note. It gives the chord its name.
Eb
Minor third(♭3)
The defining minor interval above the root.
G
Perfect fifth(5)
Adds strength and stability.
Bb
Minor seventh(♭7)
Adds the defining minor-seventh color.