What are they, and why? My top three (videos embedded below the fold):

1. Mosh (Eminem): incredibly detailed and powerful indictment of Bush, works on many different levels ending with an appeal to vote. (kid oakland commentary)

2. Yes We Can (Obama + various): the music emphasizes his lyrical cadence and makes his message both hip and dignified. (We versus I discussion)

3. The Clintons (HRC + Bill): spoof of the Sopranos finale, shows her lighter side while still making it clear that she calls the shots. (Bill's take at the time)

So now that I took the obvious ones, what would you folks list? What had an impact, or was funny, or made a great point, or inspired you?