When Michael Fitzpatrick’s friends started calling him Fitz to differentiate between other Michaels, how did they know it would make a killer name for a front man with a band rejuvenating a retro sound? Fitz & The Tantrums (FATT) played at Mercury Lounge on May 28th before hitting DC and Philly over the holiday weekend. I sat down with the guy who started it all through the acquisition of an old organ from a fire sale (using a tip by an ex-girlfriend of all things, very fitting). The band opened with the first song written on the instrument, “Breakin the Chains of Love” with a fast and furious tempo that immediately rocked the packed space. There were calls for audience participation throughout the set, from shout outs, getting low to jump on cue and even a “Hi Mom and Dad” for Fitz’s parents in the audience. Two encores were offered to the adoring crowd, ending with “We Don’t Need No Love Songs” —from you Fitz, oh yes we do.