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
...don't know if you would consider Peter Gabriel as a group, but if so: 
SLEDGHAMMER!
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....
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.
falconquest,
The question was about a group's epic song, not a list of bands. What were you thinking?
Post removed 
Epic... in terms of production, sound quality, songs, etc... I'd vote for two Supertramp albums:  Crime of the Century of course, but also the less appreciated (post-Hodgson) Brother Where You Bound.  Several tracks are a musical journey, and reference quality sound production.  I've heard 3 different CD pressings of "Brother" over the years, and my first edition CD from 1985 is still the most dynamic.  Get it if you can! 
King Crimson - Court of the Crimson King AND Starless.
Yes - Close to the Edge.
Rush - 2112.
Pink Floyd - Us and Them.
Van Der Graaf Generator - A Plague of the Lighthouse Keepers.
Can - Halleluhwah.
WAR - The World is a Ghetto.
Genesis - Suppers Ready.
Lynyrd Skynyrd - Free Bird.
Mike Oldfield - Tubular Bells.
Roxy Music - Avalon.
Henry Cow - Living in the Heart of the Beast.
Zappa - Way too many to list.....
Iron Butterfly: In-A-Gadda-Da-Vida
Steely Dan: Hey Nineteen
Wishbone Ash: Throw Down the Sword
Yes: Starship Trooper
Allman Brothers: Whipping Post
Janis Joplin/Big Brother: Summertime
Ahhh here is another one. Yes "Close to the Edge" Elements of different intensties and moods. I hear several epic parts of this masterpiece. The organ and guitar solo near the middle and Jon Anderson's emotional ending. "Epic"
My choice for another epic song would be Baba O'Reilly (aka Teenage Wasteland) by the Who. Builds slow and builds and builds till a feverish ending. Great lyrics. Epic
Here are some elements that I plucked of the internet to help convey the intent of my post. Don't get me wrong some of the songs members brought up are awesome and powerful.
"Epic Rock is an alternative label for Symphonic Metal and similarly grand-sounding Rock Music for North America and elsewhere that Metal is defined by a complete absence of pop elements. ... Music that sounds "epic" in addition to being Rock."   

"majestic;impressively great:the epic event"

"Oftentimes the climax at the moment where most people go "whoa...this is epic..." has an adjusted meter of some kind. Sometimes the music will go into a doubletime feel; in my opinion, this matches the human reaction of relaxation at a moment of climax. (Insert sex analogy"

Bob Dylan: "Sad Eyed Lady Of The Lowlands". On his 1966 album Blonde On Blonde. 11:22 long, a song length unheard of at the time.

The Who: "A Quick One While He's Away". Their 1967 pre-Tommy mini-operetta, taking up one side of an LP. 

Queen - Bohemian Rhapsody
Clapton - Layla
Guns and roses - Paradise City
Tom Petty - American Girl
Bob Dylan - Tangled Up In Blue
Bruce Springsteen - Thunder Road

Awesome, keep them coming. When my Dragon comes back next week I'm going to make a mix tape of some. I bet the 20 somethings have never done that.
Lots of great ones I see!

Pull me under - Dream Theater
Frankenstein - Edgar Winter
Snorting whiskey drinking cocaine - Pat Travers

Oh there are so many!
For Hendrix it would have to be "Third Stone from the Sun. Starts out slow and easy. Then builds to an epic feedback solo.
Regarding Jimi Hendrix, I will have to disagree and say 1983 (a Merman I should turn to be).
Someone mentioned You Really Got Me for the Kinks.  I would say that was their iconic song, but I think their "epic" would be Waterloo Sunset.

 Hendrix   " Voodoo Child (Slight Return)"
(Originally titled "Voodoo Chile (Slight Return)" on UK Track release)
roxy, I admit to being one who didn't take the term "epic" literally enough. I named titles which I consider epically great, but that wasn't the question. Some of mine do fit the term, such as Richard Thompson's "Shoot Out The Lights" and Television's "Marquee Moon". Here's another: Dave Edmund's reworking of Khachaturian's "Sabre Dance" when he was in the group Love Sculpture.
I'm disappointed to see members mentioning not necessarily the most epic songs by a band, but rather the old, most popular hits that everyone knows by heart.
I must agree with OP concerning Deep Purple and Child in Time. I think that would be their high water mark. Let's see, what else...

Sway - Rolling Stones
November Spawned a Monster - Morrissey 
Accidentally Like a Martyr - Warren Zevon
Precious - The Pretenders
I've Returned - Squeeze
Junkhead - Alice In Chains
Street Life - Roxy Music
It's Over - Level 42
Untogether - Lush
Adam and Eve - October Project

I could think of a million more, but these are the first to come to mind. 


My personal Musings on the subject.....
+1 for Genesis, Suppers ReadyProcol Harum, Whiter shade of PaleSmall Faces, Itchykoo ParkThe Rolling Stones, Finger Print FilePatti Smith Group, WaveTodd Rundgren, Parallel LinesPink Floyd......Ok, everything they did.Traffic, Dear Mr. Fantasy (I know some will argue Low Spark but I dig Mr. Fantasy)Adrian Belew, I am what I amKing Crimson.....(Ok, lets not even go there at trying to guess.)Yes, "Siberian KhatruNeil Young, Old Man or A Man Needs a Maid or Cortez.....you pick.Andrew Newton, His version of Hallelujah (best I ever heard anywhere by anyone. Ever!)Genesis, Seven Stones.....wait, I already chose....Van Morrison......(all he has to do is open his mouth and it’s epic)Mark Knopfler, (see Van Morrison above but add guitar)Santana, Soul Sacrifice Live at Woodstock https://www.youtube.com/watch?v=AqZceAQSJvc
Speaking of Woodstock: Joni Mitchell, Woodstock performed live, what a voice! https://www.youtube.com/watch?v=3aOGnVKWbwcSpeaking of voices, the woman with the four octave voice.....Phoebe Snow, https://www.youtube.com/watch?v=7OxTVxGhHFMAllman Brothers Band, Melissa.....love this acoustic version https://www.youtube.com/watch?v=ggeab0lKz2c
Natalie Merchant, Um, well, if I had to choose then (hand over my eyes) Gulf of ArabyTori Amos, IciclesELO, Can’t get it out of my HeadThe Band, of course, The Weightetc.....etc.....etc.....





Ten Years After’s I’m Going Home at Woodstock is even more epic coming in at 11:24 on Youtube. Maybe the most epic of them all. Excellent sound quality. Headphones are recommended.

https://youtu.be/bW5M5xljdCI
OK what about The Rolling Stones and Goin' home from Aftermath UK version of course
It isn't their best or most memorable song maybe 'epic' isn't the right catagory perhaps song that redefined a group or introduced something new. The wiki page on the song  is an interesting read. 
djones51 -
Appreciate the explanation for your choice of Tomorrow Never Knows as The Beatles’ epic. Revolver and that track in particular certainly announced a "new direction" they were taking
Some more goodies for you....
Sara - Bob Dylan
Lightnin strikes - Lou Christie
Cheryl's goin home - Bob Lind
On Saturday afternoons in 1963 - Rickie Lee Jones
Monday Monday - Mamas and Papas
Thats Right - Neil Christian
Elouise - Barry Ryan
Stuck inside of mobile with the memphis blues again - Bob Dylan
Supertramp - School, Breakfast in America, Crime of the Century
Beatles - Yesterday, Hey Jude
Neil Young - Heart of Gold
Bruce Springsteen - Born in the USA, Tougher than the rest
Joe Cocker - Up where we belong
Stanley Clark - Vulcan Princess

Talking Heads-Burning Down the HouseEagles-DesperadoRolling Stones-Ruby TuesdayBob Dylan-Lay Lady Lay
Jethro Tull-Locomotive BreathPink Floyd-Us and ThemBeatles-Let It BeElvis-Jailhouse RockMoody Blues-Nights in White SatinSimon and Garfunkel-Scarborough FairPeter, Paul and Mary-Blowin' in the WindMamas and Papas-California Dreamin'Cars-DriveHeart-Crazy on YouPrince-When Doves CryDire Straights-Brothers in ArmsJudy Collins-Amazing GraceAretha-ThinkLinda Ronstadt-Rock Me on the WaterSteely Dan-Rickie Don't Lose That Number
I now realize many of us, certainly I, didn't take the "epic" qualifier seriously enough in our nominations.
In no particular order....
Eagles - Hotel California
Molly Hatchet- Gator Country
Skynyrd- Free Bird
Patsy Cline - Crazy
Paul Simon - Late in the Evening
Frank Sinatra - That's Life
David Bromberg - Cocaine Blues
Linda Ronstadt - Long Long Time
Stuff - Do You Want Some of This?
Doc Watson - Sadie
Eris Clapton - Layla
New Grass Revival - Lee Highway Blues
Bobby Bland - Stormy Monday Blues
Temptations - My Girl
Wilson Pickett - Mustang Sally
Elton John- Take Me to the Pilot

Elton John, “Burn Down the Mission”
Billy Joel, “We Didn’t Start the Fire”
and +1 for the Beatles, “A Day In The Life”


Gene Clark - Strength of Strings
Pink Floyd - Echoes
Neil Young - Cortez the Killer
War - All Day Music
Johnny Guitar Watson - A Real Mother For You
Bruce Hornsby - The Way It Is
Elton John - Levon
Randy Crawford - Knockin' On Heaven's Door
Stanley Clarke - East River Drive
Brad Mehldau - Since I Fell For You
The Crusaders - Hard Times

Al, speaking for myself, that’s because very few groups have a member capable of writing what I consider a song, let alone an epic one ;-). By the way, though I don't care for Joni (to put it mildly), I agree with you about Judy’s version of "Both Sides Now" ---Eric.
Since we appear to be deviating from the criterion of "groups" that was stated in the OP, I’ll add the following to my previous response:

"Both Sides Now" -- Judy Collins (written by Joni Mitchell, of course)
(The original version, that was included in Judy's 1967 "Wildflowers" album and was released as a single in 1968, not the disappointing later version that is sometimes heard).

A masterpiece, IMO.

Regards,
-- Al

The Beach Boys: "God Only Knows", written by Brian Wilson.

Jimmy Ruffin: "What Becomes Of The Broken Hearted", written by William Weatherspoon, Paul Riser, and James Dean.

The Band: "The Weight", written by J.R. Robertson.

The above are by far the most "majestic" Pop songs I’ve ever heard, on a par with Beethoven.

Bob Dylan: "Like A Rolling Stone", written by Robert Zimmerman.

Skeeter Davis: "The End Of The World", written by Arthur Kent and Sylvia Dee.

Tom T. Hall: "That’s How I Got To Memphis", written by TTH. Also done really well by Buddy Miller.

John Hiatt: "Lipstick Sunset", written by JH.

Lucinda Williams: "West", written by LW.

Richard Thompson: "Shoot Out The Lights", written by RT.

Television: "Marquee Moon", written by Tom Verlaine.

The Beatles: "Strawberry Fields Forever", written by John Lennon.

The Beatles: "A Day In The Life", written by John Lennon and Paul McCartney.

The Dwight Twilley Band: "I’m On Fire", written by DT.

Emitt Rhodes: "Fresh As A Daisy", written by ER.

Nick Lowe: "(What's So Funny 'Bout) Peace Love And Understanding", written by Declan Macmanus.