Tommy Halloran and his backing band perform live almost every night of the week — every week of the year. You'd think that a schedule like that could become a wearisome drag, but day after day Tommy Halloran's Guerrilla Swing hits with power, versatility and — if you couldn't tell by the bandmates' smiling faces — absolute glee. Besides blowing through classic covers and standards, the band is distinct and original, teetering between jazz and blues. And, really, no two shows are the same as Halloran often brings in other players to expand on the band's already huge sound. Maybe Dave Stone will join to play saxophone at a small gig at Blues City Deli, or they'll bring on a marimba player at Herbie's Vintage 72. No big deal. Just the best band in St. Louis, doing its thing — and worth seeing every time.