Gold
666
atmospheric noises make things more epic, like in opeth's ghost of perdition where you can hear a gust of wind.
Blind Guardian - And Then There Was Silence
Length isn't necessarily important. In my eyes it's the overall feeling of the song. I usually associate the word with an atmosphere that conjures a sense of triumph and grandeur. A fine example is Zemial's 'I TAN I EPI TAS' which is about the battle of Thermopylae and lasts a meager three and a half minutes. Despite it's length, it's surely the very definition of epic music.
Bathory - Through Blood By Thunder
Candlemass - A Sorcerer's Pledge
Yea, most of that album actually is pretty epic imo. I love the intro track Karelia.Good call.
Grail's Mysteries by Amorphis, d00dz.