I don't particularly plan on seeing the new version of The Lion King, but all of the advertisement has left me humming the best villain song in the entire Disney franchise -- not a minor achievement given that it competes with the likes of "Poor, Unfortunate Souls" and "Hellfire". So, "Be Prepared":
One of the things I like is that it actually shows some real insight into the underworkings of political manipulation, and it doesn't hurt that Jeremy Irons and Jim Cummings (who share Scar's vocals, since the former's voice started giving out during recording) get just about everything right in the delivery.