Basically, it's a program that automatically adds music to vocals. people take the audio track of old songs and put them on youtube. Here's some awesome ones:
Hotel California (http://ca.youtube.com/watch?v=itsT9zgWRoM)
Eye of the Tiger (http://ca.youtube.com/watch?v=_V1DuHUs22Q)
White Wedding (http://ca.youtube.com/watch?v=UlCWo1qdTdE)
Crazy Train (http://ca.youtube.com/watch?v=VFZvLprEIpw) (too good!)
Oh, and An Obama Speech (http://ca.youtube.com/watch?v=YN9pGgg8YlQ)
That is awesome. I wonder how the program works, and why it picks the music it does.
Oh and, Hotel California is so great.