Who knew a cathedral of sound could be build from Sandbox Percussion?

You'd expect a group calling itself Sandbox Percussion to take a playful approach to music -- and you'd be right, as this New York-based quartet proved Sunday in a sophisticated but seriously fun afternoon of contemporary music at the Phillips Collection. Focusing on works written, more or less, last week by composers the group knows and works with, Sandbox brought out the immediacy, lack of pretension and high-end playfulness that seems -- thankfully -- to be revitalizing the world of contempor...