ZZ Top and Gregg Allman are back at it. They're hitting the road together on a tour that will bring them to the DTE Energy Music Theatre on August 17 (8/17). Tickets go on sale tomorrow (4/8) at 10 AM. “The history with ZZ Top and Gregg Allman together goes way back to around the time the earth cooled" says Billy Gibbons. "The double lineup makes for a killer combination so buckle up and let's have a party! Rock on!”