I think it's important to have similar hobbies/interests. It's even more true with music than it would be other hobbies as music can flat out annoy someone if they aren't into what you like, while other hobbies/interests don't quite force themselves at everyone else in the room. Furthermore, I don't buy into the "date someone else to open me up to new ideas/world/etc." as the cliche saying goes. I can do that well enough on my own should I desire it. IMO the goal is to find someone you like with similar tastes who you're comfortable with to spend time together + shag, not to change who you are or your outlook on the world, etc.