Best Ad-libs/Lead??

For you, what is the song that has the best ad-lib/lead?

For me, the song "Love Song" by 311 was one of the best ad-libs/lead that I have ever heard. Although it was just a cover because it was originally from the band "The Cure"  I love their version of the song.. And also "Hotel California" of Eagles and "Sweet Child of Mine" by Guns N' Roses 

Hear it for yourselves... what's yours??