I’ll admit I immediately become skeptical of a band when I see a drum kit at the front of the stage, especially one with multiple bongo setups. I’ll make an exception for Alt-J, though, because it makes sense for them, as drums are frequently the busiest part of their sound. Drummer Thom Green can hardly maintain a constant pattern for eight measures, which works well to spice up the British quartet’s simple, clean guitar, droning electronic padding and dual-harmonic vocal leads. The combination creates a stoner-jam-band-electrono style all their own, a sound that has garnered the group vast European notoriety–even earning them a number-one album on the U.K. charts this year. Now they're making waves in the States, and unsurprisingly their large crowd spills out of the Downtown Stage area. Their set is mostly equal parts 2014’s This Is All Yours and 2012’s An Awesome Wave, and while sonically Alt-J sounds great and their draw absolutely merits a 9 p.m. show time, their four-to-seven minute songs are a bit too sleepy for an evening festival slot and would have been more enjoyable in the light of day.