Well I for one thought the technology behind Microsoft's Songsmith melody analysis tool which we shot at NAMM was pretty cool, there has been a huge amount of traffic for the viral video ad the guys made for it – but that's sorta because its so cheesy. Since then people have been getting hold of the vocals from popular hits and feeding them into Songsmith, then syncing the result to the original video – it makes for some classic results. You can see Billy (Bubba Bluegrass) Idol's version of White Wedding, but there are so many more.
There are so many more...
Keep watching.