Having become so enamored with GLEE, a few friends and I have found and also fallen in love with these Flash Mob videos:
And just to share another, here's one that's a little older:
And my favorite (yes, I know the music's the same, but I like this dance better):
Now, if only the entire world could break into song and dance at the same time. Music could heal the world. It certainly can make it a better place.