Local outfit A Lull used its opening set as an opportunity to air material from a new EP, Meat Mountain, an ethereal collection, especially in contrast to the electro-shocked concoction being banged out by Dirty Beaches simultaneously on the headlining stage. A Lull takes a different approach, and its respectable audience seemed to indicate that people are catching on. A pair of drummers splashed polyrhythms back and forth, tethered to the infallible pulse of a sample, like the percussion teams powering the Allman Brothers or Grateful Dead updated for the Pitchfork set. One of those drummers (stage left) multi-tasked (as many of A Lull's members do), squeezing out falsetto backups, though frontman Nigel Dennis was the one doing the heavy lifting, capably bantering with the crowd and carrying the band forward past pesky distractions like a broken guitar string on the first tune. The group's serene indie hadn't impressed me much on headphones but in person it's huge, epic and easy to get behind.