I'm assuming you are from the US, so I will educate you on Sweden. Sweden is the third-largest country in Europe by area so it's pretty big!
That's fairly big. What kind of bands are popular in Sweden?
Well, a quick wiki search for music of Sweden shows that they love polka, schottische, waltz, polska and mazurka. Sounds very foreign to me!
That's all fine and dandy, but what kind of modern bands are popular? Any metal bands? I'm not a fan of polka, but I think my grandma is.
Some modern bands from Sweden are Dungeon, Bob Hund, and BWO. 
Now we're talking! Where do you think is the best place to go and see them? Any cool concert venues?
Well, the Hultsfred Festival, which is an annual music festival held in Hultsfred, Sweden sounds like a pretty cool concert to attend! It takes place during three days in June or July.