The Doors - The End
King Crimson - The Court of the Crimson King
Iron Butterfly In-A-Gadda-Da-Vida
Epic Popular Songs
The Epic Poem stands as the highest literary expression.
To compare lowly rock and pop songs beggars a response.
But so be it. Your nominees have to be at least 6 minutes in length, have a notable instrumental solo, and have lyrics parsing a freshmen college standard. No lists of tress, or multiple battles or dedications to Queens most Glorious.