> Surely they could have used the same tech to seamlessly mix all music together. (i.e. take the sequences within tracks they find hard to differentiate, and then use these points to allow two tracks to be mixed together). What's the minimum number of tracks it would say take to seamlessly mix from Megadeth to Mozart?

I noodled around with this idea in my free time a few years ago, got absolutely nowhere really usable with it (I probably put in a couple hundred hours).

I knew I was limited by my dataset (small), code quality (terrible) and understanding of musical theory (virtually nil).

Maybe I'll pick up that idea again - even doing beat matching would be kind of neat.