Apple have patented a potential dj killer in that being a product yet to be announced that can beat match and mix songs perfectly.
The patent taken out in the month of August 2010 states "an electronic device" (insert Mac or iOS product here) that would be able to locate and interpret beats from a preceding AAC, MP3 or WMA file and crossfade songs perfectly into those of the following track. In other words, it's a virtual disc jockey built into your machine.
I guess everyone is going to have to learn the guitar again to look impressive? OR ARE THEY BUILDING A DEVICE TO PLAY THAT TOO?!
You can also check out an article on the new Mash Up software from Mixed in Key here