I think it’s safe to say that, whether you’re talking anime or visual novels, Fate/Stay Night is pretty well known. If you’ve been here for a while you will already know that I prefer the latter over the former, though when it comes to the opening music I feel that the anime prevails.
Disillusion is the first OP for the Fate/Stay Night anime, being slightly different from the visual novel OP of the same name.
Firstly, the OP itself:
And then the full song (skip to 20 seconds in…the intro is horrendously long):
*Edit*: 123 pointed out in the comments that there’s a new, slightly more amped-up version that was recorded for Type-Moon’s tenth anniversary: