It's a very hard choice, there are so many I want to post. (Vangelis)
http://www.youtube.com/watch?v=w0Tk0hUGm_o&feature=related
http://www.youtube.com/watch?v=SEz6rBW2DM4
http://www.youtube.com/watch?v=JAwo7DPUFUM
And now for something completely different (Ennio Morricone)
http://www.youtube.com/watch?v=nUyNjjQq_rk
http://www.youtube.com/watch?v=NOKhQ8ObQ7E (When you find the word "epic" on dictionary, you find this link)
Some epic rock (Uriah Heep)
http://www.youtube.com/watch?v=JD2ulJCRFYQ