The Ponys play the Black Cat Backstage tonight with Jay Reatard. $10, Doors at 9 p.m. The Ponys are one of those buzz bands that seem perennially plagued with the “next big thing” tag. Hailing from Chicago, a city full of legends of all sorts and more than a few hype-worthy up-and-comers, theirs is a difficult task. But 2006’s Turn the Lights Out picked up where Celebration Castle left off and took it one step…