It’s unlikely that you’re ever going to find a crowd as earnest as the gentle gang of 20-something year olds that bundle into The Button Factory for emo heroes, American Football. It’s been a long time coming but the Illinois band are finally making their Irish debut 20 years after their humble beginnings and emotions are running high among the expectant audience. The first thing to notice about American Football is that, despite how few shows they’ve actually played over the last two decades, you’d be hard pushed to find a band more technically accurate. Each song sounds identical to…