It's opossum posting time!
This is an inclusive community
There is only one answer: Rock out harder and indicate to them that you're having a good time.
If they're decent then they'll like it, and if they're not, then it'll do them good to get all irritated under their skin about it when they see that you're having fun. You're allowed to have fun.
this person rocks and fucks.
Most of the time people smile. I always try to guess if someone is listening to the same radio station. Seems less and less likely, but it would be fun.
I'm not planning on driving anytime soon, but having a space where I can just jam out without anybody hearing me is tempting. Being a pedestrian living in a dorm in a city, I do not get as much jam time as I'd like.