I gotta go with Skynyrd's "Free Bird." I got my first electric guitar in 10th grade, and my brother got me a Lynyrd Skynyrd greatest hits CD. I of course has heard "Sweet Home Alabama" before, and worked on learning that. As I listened to the rest of the CD, I kept skipping "Free Bird" because of the slow intro. When I finally sat down and listened through it, I really enjoyed the slide lead, but was blown away by the second half.
"Well, if you can’t have a great season, at least ruin somebody else’s." - Olin Buchanan