For more than two decades, the nine-person a cappella group has provided the soundtrack of the season, bringing millions of fans to their feet while putting them in the holiday spirit. This year will be no different. On the heels of the group's 25th anniversary, and with more than 1.5 million tickets sold worldwide, Straight No Chaser's iconic blend of complex harmonies and clever mashups offers a fun and freewheeling opportunity to experience holiday classics and modern favorites in a distincti...