(WILLIAMSTOWN, Mass.) — Trio con Brio Copenhagen, one of today’s most exciting young chamber ensembles, performs an eclectic program featuring works by Beethoven, Schubert, and Frank Martin at The Clark on Tuesday, August 9 at 8 pm. Korean sisters Soo-Jin and Soo-Kyung Hong and Danish pianist Jens Elvekjaer created the trio in Vienna in 1999…