4-String Banjo Chord Chart and Tabs in Gbb Tuning

Sib7b5, SibM7b5, SibM7b5, SibM7b5, Sib dom7dim5
Notes: Si♭, Ré, Fa♭, La♭
6,9,9,0 (123.)
6,7,5,6 (2413)