I don't even know why "Stairway to Heaven" is the first song to come to my head but it was.
Sidenote, Wayne's World really threw me off the trail with Stairway and I finally found out why after reading about the movie last week. They lost the rights to use the first five notes for any version of the Stairway to Heaven except for the one shown in theatres. Since my first brush with Wayne's World was on VHS, the riff Wayne played in the "No Stairway" scene was nothing like what I'd eventually discover Stairway to be.
Scene in question: http://www.youtube.com/watch?v=RD1KqbDdmuE