I go to shows by myself all the time. I go to a really wide variety of shows and no one I know wants to go to "uncool" types of concerts like jazz or klezmer or chamber music or the wrong kind of indie rock band. Their loss! Some of the best concerts of my life, I saw alone.
You should go. What's the worst thing that could happen? Maybe you'll meet some new friends who share your interest in that kind of music. If your friends don't go to concerts, a concert is a great place to meet friends who do
Another thing you can do is see if there is an online forum for that music, and see if anyone else is going to that show, and see if some people want to meet for a drink before the show or something. Then you can have someone to hang out with if you're uncomfortable being alone at a concert. I've done that a few times, too, I am still in touch with some people I met that way.