Banjo D7 chord (Open G)D seventh on the 5-string banjo: 0 2 1 4, and 5 more shapes

Frets, string 4 to string 1: 0 2 1 4 (open position)

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

Sounds: D A C F♯  ·  D7 is D, F♯, A, C (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.

Up the neck: Barre 7 shape: 7 7 7 10 (7fr); F7 shape: 12 11 10 10 (10fr); E7 shape: 12 11 13 12 (11fr). Slide a shape up or down to play another chord of its kind.

Open G tuning: gDGBD, the short 5th string first, then strings 4 to 1.