Well, isn't this interesting: Twitter user @megcat79 just noticed that the National's website lists an April 21 date at the Scottrade Center here in St. Louis -- with newly minted Grammy winners Arcade Fire. Now, the latter's own site has nothing about this concert yet -- but April 21 is between an April 20 stop in Kansas City and a three-night stand in Chicago, so the date is open. Still, this show should be considered unconfirmed until the venue gives us official word. Stay tuned to A to Z for confirmed information if and when we get it...