Haven't played tekken in ages and i like street fighter too but i wasnt a fan of sf4 (i like mvc 3 tho) Never was much of a cod fan tho i always end up playing with my friends anyway lol
Never heard of wintersun b4 and i did tried to play it wasn't so hard at first (got used to the palm muting) but then there was this lovely sweep and sweeping is my weak point right now lol, nice song tho
If you want a slower song, you can try Sleeping Stars, Sadness and Hate, or Death and the Healing. Not really a whole lot to choose from since there's only 1 album available. You can also try the singer's former band Ensiferum. Something like Lai Lai Hei or Twilight Taver.