Sploid is one of my favorite new blogs. Check this out.
Here's a fun little musical experiment from The Gregory Brothers. They flipped major and minor keys in popular songs to transform previously happy songs into sad ones and turn old depressing sad songs into happy ones. It sends your brain in a tizzy when you hear the words of songs you recognize but see them in a whole new light.
Some key changes of songs work better than others but when they do, they're quite fun to hear.