What songs have the most recognized guitar riffs in all of Rock and Roll?

Off the top of my head would be Smoke On The Water, Stairway to Heaven and Back In Black.

Layla, Sweet Child Of Mine, Like A Hurricane, Wild Thing,Whiskey In The Jar.

Money For Nothing - Dire Straits

Smoke On The Water - Deep Purple

Misty Mountain Hop, Stairway to Heaven, Moby Dick - Led Zep

Master of Puppetts - Metallica

Enter Sandman - Metallica

Smoke On The Water - Deep Purple

Crazy Train - Ozzy Osbourne

Paranoid - Black Sabbath

Highway To Hell - AC/DC

Back In Black - AC/DC

Sweet Child O' Mine - GNR

You Really Got Me - Van Halen

Walk This Way - Aerosmith

Dream On - Aerosmith

Kashmir - Led Zeppelin

Smoke on the Water/Deep Purple

Iron Man/Black Sabbath

Whisky in the Jar/Thin Lizzy

Sweet Child O Mine/GNR

Heartbreaker-Led Zep

Limelight - RUSH Bark at the Moon - Ozzy Rising Power AC/DC Metal Storm/Face the Slayer - Slayer Black Betty - Ram Jam Waitin for the Bus - ZZ Top No Good (Attack the Radical) - Pantera

Stairway To Heaven & Sweet Child Of Mine

Just two right off the top of my head...

Layla

Walk This Way

Tusk

Frankenstein

Godzilla

Day Tripper

Iron man, Smoke On The Water, Enter Sandman, Smells Like Teen Spirit, Back In Black, sweet child o mine, Welcome to the Jungle

Sweet child o mine

Whole lotta love

Smoke on the water

Alright now

Black night

Voodoo chile

Since you ve been gone

Should I stay or should I go

Paranoid