Not many groups claim nearly two dozen active members — all ambling onstage in flowing white robes — or cite David Bowie as an early champion, but The Polyphonic Spree is no ordinary band.

the Polyphonic Spree are a "big band" in the literal sense of the world, having as many as 27 members at some point. The Dallas band's colorful attire and free-spirited attitude, not unlike what ...