Every concertgoer is different in what they will bring to shows with them, but the usual is pretty standard: phone, wallet, keys and hopefully earplugs (you’ll thank me in due time). John Darnielle will probably follow the same ritual, except he’ll be bringing a 600-song catalog with him when the Mountain Goats come to O-Town for two nights. They won’t be playing over 600 songs, but the Mountain Goats put on the type of live performance that leaves the audience pining for just one more song.