Music review: Danish String Quartet's set at Library of Congress lacks fire and character

String quartet playing requires a unique level of simpatico and mutual dedication. The rehearsal time and note-by-note scrutiny required from all members exceed that of any other ensemble, and in this high-intensity environment it helps a lot when the members have a common background. Which is likely why so many of the most celebrated quartets (Borodin, Tokyo, Berg, Smetana, Italiano) have been those where everyone came from the same place. And the Danish String Quartet -- three Danes and a Norw...