Kalafina's and FictionJunction producer, Yuki Kajiura is the best musician that I have ever heard!
Here's some subbed videos of
Anime's opening and ending
See-Saw : Gundam Seed opening; Anna ni Isshou Datta no Ni
And lot's more!! I really love FictionJunction and Kalafina, but FictionJunction's videos are quite hard to find.