Few chamber music groups have as proud a history as the Smetana Quartet, or a history that evokes as much nationalistic passion. Founded during the Nazi occupation of Czechoslovakia, the group's very existence was an anomaly during an era when any manifestation of Czech nationalism was outlawed. They survived into the post-Nazi era, and went on to an acclaimed international performing career, making some of the finest chamber music recordings of the 1950s and 1960s…