So Percussion is an American percussion quartet based in New York City. Composed of Josh Quillen, Adam Sliwinski, Jason Treuting, and Eric Beach, the group is well known for recording and touring internationally and for its work with composers such as Steve Reich, David Lang, Paul Lansky, Martin Bresnick, Steven Mackey, Fred Frith, Evan Ziporyn, and Arvo Pärt. See them at Helmerich Theater at Cascia Hall tonight.