About the Bbm7 chord
To play Bb minor 7th, use the first shape above. Use your index finger to barre the 1st fret across the G, C, E, and A strings. Strum all four strings and check that each one rings cleanly.
Root
Bb
Quality
Minor 7th
Notes
Bb · Db · F · Ab
How the Bbm7 chord works
Bb
Root(1)
The home note. It gives the chord its name.
Db
Minor third(♭3)
The defining minor interval above the root.
F
Perfect fifth(5)
Adds strength and stability.
Ab
Minor seventh(♭7)
Adds the defining minor-seventh color.