Sonar used to be in Canton and recently moved downtown.
Hammerjacks used to be a blue collar rock club that had rock shows. It was sold when the land was developed into the Raven's and Orioles' stadiums.
The owner then openned a new club under the same name in another location in downtown Baltimore and tried to host rock shows that didn't go too well. Thats when he brought in differentr promoters and held hip hop DJ nights.