A better way to conceive of creativity
Kirby Ferguson: Embrace the remix : Video on TED.com

I wonder how long it will be until we're able to track elements (melody, lyrics etc) in one song to other songs. And by "we" I mean, computers, automatically and without help.  There are already sites  displaying the make up of actual remixes by artists like Girl Talk - all manually built.

When someone builds an automated version, it'll be interesting to see what happens to copyright law.  I imagine we'll be awash in this kind of case for a while.  With luck, copyright laws will be softened, rather than strengthened, else creativity become the exclusive domain of companies with large IP portfolios.