Banjo A♭m chord (Double C)A♭ minor on the 5-string banjo: 3 4 3 6, and 2 more shapes

Frets, string 4 to string 1: 3 4 3 6 (from the 3rd fret)

1. String 4 (C): 3rd fret, index finger (barre), E♭
2. String 3 (G): 4th fret, middle finger, C♭
3. String 2 (C): 3rd fret, index finger (barre), E♭
4. String 1 (D): 6th fret, little finger, A♭
5. String 5, the short g: open, G, not in the chord

Sounds: E♭ C♭ E♭ A♭  ·  A♭m is A♭, C♭, E♭ (1 · ♭3 · 5)

Found in: B major (vi), B mixolydian (vi), E major (iii), F♯ major (ii), F♯ mixolydian (ii), D♭ mixolydian (v)

The 5th string: the short g rubs against the A♭ 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.