In just over a year, soulsters Fitz & the Tantrums went from the living room to the main stage. The recipe for success? Six killer musicians, five dapper suits, irresistible songs, some serendipity and one vintage organ. Since their first show in Hollywood, December 2008, Fitz and co. have toured with Maroon 5, played to thousands at Red Rocks, shared the stage with Sharon Jones and the Dap Kings, and performed on KCRW. For some bands, it takes a lifetime to build this success, but few performers deliver an unrestrained blast of soul-clapping, get-down-on-the-floor shakers like Fitz and the Tantrums.