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I'd like to start my epic songs post series with the song which made me listen to metal:
Iced Earth - Dante's inferno:
This song is the one of best examples for epic music:
the song is about Dante's (According to Dante Alighieris Divine comedy) journey through the nine plains of hell (to take this as the song theme is itself alone epic):
The song starts with a quite long intro (1:37 min). And it's very, very gloomy. Then the song becomes immediately harder & faster. It's like a punch. But it's only the first punch and the punches don't stop. And if it's only to give birth to some epic satanic chorals (at about 8:30 min) followed by the most epic part of the song which culminates in the really most epic drum solo ever (9:43 min). It blew (& still blows) me away.
I think this youtuber agrees with me: