At Wolf Trap, Jack String Quartet shows its modernist mastery

When it comes to cutting-edge music, the young virtuosos of the Jack String Quartet don't shrink from much. They're renowned for their fearless embrace of even the thorniest new works, and their performance of the complete quartets of Iannis Xenakis a couple of years ago in Baltimore was one of the most ear-changing, tour-de-force chamber music concerts of the year. So when the group arrived at the Barns at Wolf Trap on Friday night (with clarinetist and composer Derek Bermel), it promised to be...