The b-flat was launched in 1995 by musician brothers Jannis Zotos and Thanassis Zotos and the actor André Hennecke. From 1997 on Joerg Zieprig has been responsible for booking. The club is located near Hackescher Markt at Rosenthaler Strasse 13. It is open every night and has become an inherent part of the Berlin jazz scene. Local as well as internationally renowned musicians play jazz music of all different styles. On Wednesday nights there is a regular weekly jam session hosted by bass player Robin Draganic who is joined by varying guests.