4-String Banjo Chord Chart and Tabs in Gbb Tuning

SibmM7, Sibm#7, Sib-M7, Sib−Δ7, Sib−Δ, Sib minmaj7
Notes: Si♭, Ré♭, Fa, La
6,6,6,7 (1112)
6,2,2,3 (3112)