Yes, OK Go is "that treadmill band" — you know, the video your mom forwarded to you oh-so-many moons ago. But as the band's fan base can attest, OK Go is so much more than that. Over the past decade, the Los Angeles-via-Chicago quartet's music has evolved from slickly produced radio pop (2002's self-titled debut) to grittier, T. Rex- and Pixies-influenced rock (2005's Oh No). This year's brilliant Of the Blue Colour of the Sky is even more out there: It can only be described as Prince making a Flaming Lips record — or maybe the Flaming Lips making a Prince record. These stylistic left turns have been well executed, but, of course, they've also resulted in some puzzled looks from dudes in Delta Omega Nu T-shirts and Reef sandals (i.e., the type of fan who jumped onboard because of said treadmill video). While pandering might've earned the band a tour or two in larger rooms than where it is tonight, OK Go displays a certain level of exuberance on a small stage that just can't be duplicated.