Banjo D6 chord (Double C)D sixth on the 5-string banjo: 2 4 2 4, and 4 more shapes

Frets, string 4 to string 1: 2 4 2 4 (first position) · no 5th

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♯  ·  D6 is D, F♯, A, B (1 · 3 · 5 · 6)

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

With a capo: on the 2nd fret it’s 0 2 0 2 (frets counted from the capo), an open C6 shape. Spike the 5th string at the 7th fret to keep it in tune with the capo.

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