I cheated...it's over....but should I still attempt to be friends?

This guy you were seeing is the wiser of the two of you. It's best to break it of completely. Ever hear the quote: "one thing leads to another"? You need to try to work on your marriage and ask your husband to attend with you. I don't appreciate my wife's choice of music but when we go out, I make it up by doing something we both like after-wards and try to enjoy HER enjoyment of the music. Quality time is building time. Ask your hubby first, if he says "no thanks", ask another g/f or sell the ticket. Under no cirstances should you have anything to do with this other guy. It almost sounds like you're looking for reasons to see him again or at least be in his company. This has nothing to do with a band and does absolutely nothing but keep you further and further from marriage. Concentrate on your husband and your relationship to be something that makes you both happy. There should not be "his" likes and "my" likes. You should learn to like doing things together. You've already replaced your husband in this area of your relationship.....not good.