Went to the Black Cat last night for no particular reason — a friend of mine wanted to go out and then looked up the band The Mantis and was mildly interested. So I was like, ok, sure. Ten bucks, something to do on a Wednesday night. We hit the backstage one or two songs into the set by openers America Hearts . My first reaction was, this is ok, I have heard a lot of worse bands before. It was pleasant garage-y pop music with a singer/guitarist who looked about 15. Basic stuff, but not bad. Afte…