Here's a link to one of my favorite songs from the band X Japan. I've listened to the song..I couldn't tell you HOW many times, but I love the guitar in this particular song. It may be kind of hard to hear over the drums from time to time, but if you listen closely, you can hear how epic it is
X Japan - Kurenai Live 1992
Now I'm not going to say, "ZOMG!! THIS IS LIEK TEH BEST RIFF EVAR!!!111111", despite liking this band a LOT, but I do believe I can associate "epic riff" with Hide's performance (damn I miss him..
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Not to mention, the overall song, of just EVERYTHING is pretty epic in itself, so..even if you don't think the guitar is that great, you'll probably find something else within the song that will make you go
Enjoy