Banjo B7 chord (Double C)B seventh on the 5-string banjo: 3 2 3 4, and 4 more shapes

Frets, string 4 to string 1: 3 2 3 4 (first position) · no root

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

Sounds: D♯ A D♯ F♯  ·  B7 is B, D♯, F♯, A (1 · 3 · 5 · ♭7)

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.