I'm from the David Letterman School - not the John Cusack Academy. Five is only halfway there.... MY top ten:
"Johnny B. Goode" - Chuck Berry
"Louie, Louie" - the Kingsmen
"Wild Thing" - the Troggs
"A Day In The Life" - the Beatles
"Voodoo Child (Slight Return)" - Jimi Hendrix
"Communication Breakdown" - Led Zeppelin
"Sympathy for the Devil" - the Rolling Stones
"Iron Man" - Black Sabbath
"Anarchy In The UK" - Sex Pistols
"Smells Like Teen Spirit" - Nirvana