Banjo B♭maj7 chord (Sawmill)B♭ major seventh on the 5-string banjo: 8 7 5 7, and 2 more shapes

Frets, string 4 to string 1: 8 7 5 7 (from the 5th fret)

1. String 4 (D): 8th fret, little finger, B♭
2. String 3 (G): 7th fret, middle finger, D
3. String 2 (C): 5th fret, index finger, F
4. String 1 (D): 7th fret, ring finger, A
5. String 5, the short g: open, G, not in the chord

Sounds: B♭ D F A  ·  B♭maj7 is B♭, D, F, A (1 · 3 · 5 · 7)

The 5th string: the short g adds the 6th over B♭maj7, a colour rather than a clash.

Sawmill tuning: gDGCD, the short 5th string first, then strings 4 to 1.