What is the epic song of a group?


I will start. I vote for Stairway to Heaven for Zep. Its grand with a great finish. I will throw in Salisbury by Uriah Heap. Ok lets see some posts of what you think is a groups masterpiece.
128x128blueranger
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falconquest,
The question was about a group's epic song, not a list of bands. What were you thinking?
Traffic - Low Spark of High Heeled Boys
This truly Epic.

For Eric Clapton - I would say Layla even though I personally think Wonderful Tonight (about the same woman) is the better song. It's just not epic.
When I was a small boy I heard 'River Deep,Mountain High' by Tina Turner for the first time.  The melody of the song made an awesome impression on me and the hairs on my neck literally stood up.  That was a rare experience....