I've been to a few gigs on my own. Met a whole new circle of friends because of one,who I still visit regularly (they live in a different city)
I also took a 4 day break away to Paris on my own and went to a concert. I actually enjoyed the experience having some time to myself, going to cafes just to read a book or whatever. I'd do it again out of preference rather than necessity.
This.
Hey man, listen. You just said earlier that most of your friends are hiphopheads. You could end up meeting up with folks at the show that are cool, expand your friends circle, and BAM! Next time you go to another rock concert, you'll have folks that you can go to the next show with.
Win.