Banjo Bm chord (Double C)B minor on the 5-string banjo: 2 4 2 4, and 3 more shapes

Frets, string 4 to string 1: 2 4 2 4 (first position)

1. String 4 (C): 2nd fret, index finger (barre), D
2. String 3 (G): 4th fret, ring finger, B
3. String 2 (C): 2nd fret, index finger (barre), D
4. String 1 (D): 4th fret, little finger, F♯
5. String 5, the short g: open, G, not in the chord

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

Found in: G major (iii), A major (ii), D major (vi), A mixolydian (ii), D mixolydian (vi), A dorian (ii)

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

Double C tuning: gCGCD, the short 5th string first, then strings 4 to 1.