Straight No Chaser had its breakout moment with a little bit of Christmas. The video of the a cappella group's version of "The 12 Days of Christmas" went viral, and Straight No Chaser became a success — and had its name forever linked with holiday tunes.

That doesn't mean the Straight singers don't offer pop songs, too, as they've turned their harmonizing voices on numbers as diverse as "Thriller," "Happy" and "Creep." But they don't shy away from carols. In fact, they just released their third Christmas album, "I'll Have Another ... Christmas Album."

Since it is, after all, the Christmas season, expect to hear plenty of those songs when Straight No Chaser brings its 20th anniversary tour to Mohegan Sun Arena on Friday.

Straight No Chaser, 7:30 p.m. Friday, Mohegan Sun Arena; $30; 1-800-745-3000.