What is the epic song of a group?

Boston  "Long Time"
Simon & Garfunkel  "America"

Brownsville Station "Smokin’ in the Boy’s Room"
REO Speedwagon "Ridin’ the Storm Out"
Kansas "Dust in the Wind"
Jackson Browne should be "These Days" but probably "Running on Empty"
Gregg Allman "Midnight Rider"
Thin Lizzy "Johnny the Fox"
Warren Zevon "Warewolves of London"
Foghat "Slow Ride"
Eric Clapton "Layla"
Steely Dan "Reelin’ in the Years"
Doobie Brothers "Jesus is Just Alright"
Neil Young.. simply because of radio play "Southern Man" or "Old Man"
America "Ventura Highway"
Joe Cocker "With a Little Help From my Friends"
Sweet "Ballroom Blitz"
Sniff n’ the Tears "Driver’s Seat"
Walter Egan "Magnet & Steel"
Dire Straits because of MTV "Money for Nothing"
Pink Floyd "Money"
Bob Seger "Night Moves"
Grand Funk  "We're An American Band"

Janis Joplin "Me & Bobby McGee"
Aretha Franklin "Respect"
Bill Withers "Use Me"
Otis Redding.... the above....
Isaac Hayes "Theme from Shaft"
Peter Frampton "Do You Feel Like We Do"
Peter Gabriel "Sledgehammer"
T Rex "Bang a Gong"
Mountain "Mississippi Queen"
Ram Jam  "Black Betty"

I decided to forgo the major artists that have decades of output. (Where do you start?)

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"