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.
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Cake  "Short Skirt, Long Jacket"
Aldo Nova  "Subject's Theme"
Night Ranger  "Sister Christian"
Black Sabbath  "Iron Man"
Van Halen  "Jamie's Crying"
Roy Orbison  "Cry'n"
Ringo Starr  "Photograph"
George Harrison  "While my Guitar Gently Weeps"


You Really Got Me - The Kinks

I need to stop these songs are popping in me head in no particular order. 
Another example would be "Eruption" by Focus. "Warning" by Black Sabbath. "Fire on High" by ELO. "2112" by Rush."Funeral for a Friend" by Elton John. "Close to the Edge" by Yes.