Banjo B♭m chord (Open D)B♭ minor on the 5-string banjo: 3 4 4 3, and 2 more shapes

Frets, string 4 to string 1: 3 4 4 3 (first position)

1. String 4 (D): 3rd fret, index finger (barre), F
2. String 3 (F♯): 4th fret, middle finger, B♭
3. String 2 (A): 4th fret, ring finger, D♭
4. String 1 (D): 3rd fret, index finger (barre), F
5. String 5, the short f♯: open, F♯, not in the chord

Sounds: F B♭ D♭ F  ·  B♭m is B♭, D♭, F (1 · ♭3 · 5)

Found in: F♯ major (iii), D♭ major (vi), A♭ major (ii), E♭ mixolydian (v), D♭ mixolydian (vi), A♭ mixolydian (ii)

The 5th string: the short f♯ rubs against the F in this shape, a semitone away: some players let it ring, some skip it.

With a capo: on the 3rd fret it’s 0 1 1 0 (frets counted from the capo), an open Gm shape. Spike the 5th string at the 8th fret to keep it in tune with the capo.

Open D tuning: f♯DF♯AD, the short 5th string first, then strings 4 to 1.