From reading this thread I feel pretty proud of being swedish!
Let's not forget that the swedish music wonder extends itself to other sorts of music to. As mentioned earlier much of the comercial mainstreem pop is written in and by sweds.. Lady Gaga works alot with a swedish producer called Red One for example. But then we have the swedish deathmetal scene to, both a Gothenburg(At the Gates, In Flames) and a Stockholm(Entombed, Dismember) sound. And don't forget that we got some of the leading bands when it comes to retrorock to. Hellacopters, Graveyard and the likes.
There is not that much to do here during wintertime so I think many people play music instead of going out alot.