It's amazing that Chiat/Day did not get permission from Eminem's publishing company to use his song in that commercial. I guarantee MTV, Apple and Viacom assumed that permission was given. Working in advertising and marketing, I know what a pain in the ass it can be to get permission to use copyrighted material - and the specificities of use. As high profile as all these companies are, this is a major goof - I bet it was a contractual goof.
Matt
http://www.macnn.com/articles/05/05/...es.with.apple/