Banjo C7 chord (Open G)C seventh on the 5-string banjo: 2 3 1 2, and 3 more shapes

Frets, string 4 to string 1: 2 3 1 2 (first position)

1. String 4 (D): 2nd fret, middle finger, E
2. String 3 (G): 3rd fret, little finger, B♭
3. String 2 (B): 1st fret, index finger, C
4. String 1 (D): 2nd fret, ring finger, E
5. String 5, the short g: open, G, in the chord

Sounds: E B♭ C E  ·  C7 is C, E, G, B♭ (1 · 3 · 5 · ♭7)

The 5th string: the short g is the 5th of C7, so let it ring.

Up the neck: Barre 7 shape: 5 5 5 8 (5fr); F7 shape: 10 9 8 8 (8fr); E7 shape: 10 9 11 10 (9fr); D7 shape: 10 12 11 14 (10fr). Slide a shape up or down to play another chord of its kind.

With a capo: on the 5th fret it’s 0 0 0 3 (frets counted from the capo), an open G7 shape. Spike the 5th string at the 10th fret to keep it in tune with the capo.

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