Animation? United States? Is that a joke? How can you be a forum goer on a game website without being a weeb?
Music: United Kingdom
Movies: I haven't seen many foreign films and I think this is the one category where people really focus on an American-centric catalog, it's almost unfair really, I guess I'll just go with United States anyways by default.
Video games: Japan
Animation: I almost have to go with this one by default too because I've seen more anime as a conscious sentient being than I have American animation ... been a long time since I watched a good Disney film ... and most of the modern ones suck. So Japan I guess, but there's a ton of good American cartoons ... especially on TV