POLYGANZA:

Formed in Texas by bandleader Tim DeLaughter in 2000, this massive group -- the number of members often nudges toward 20 or more -- is well-suited to re-imagine popular Christmas music, combining the instrumentation of a rock band with the layered harmonies of a choir.

This Christmas season, the band has hit the road with its "Holiday Extravaganza," turning each of its shows into a sort of traveling holiday music carnival. Here, The Polyphonic Spree brings its dense, exuberant songs to the World Cafe studios to perform spirited renditions of Christmas classics.

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