The mostly instrumental band Polyphia has such a mix of influences that it satisfies the discriminating taste of jazzheads, world-music chasers and those dudes who sit in the corner of Deep Ellum bars with an approving stank face while lost in the groove. The group's broad appeal is easily quantifiable; Polyphia has millions of listeners just on Spotify. But the Plano band that plays to huge crowds around the world isn't a household name in Dallas — at least not yet. Wait until word gets out that a local band is popular elsewhere, and local fans will flock to it; it's a Dallas tradition.