Here’s a video that is one part neuroscience and one part warm fuzzies. Bobby McFerrin and Crowd Participation, via Joshua Blankenship. Even if you don’t know who Mr. McFerrin is, you do: he sang "Don’t Worry, Be Happy". The video is actually two clips that have been joined together, so keep watching after the first one ends. It gets even better at the 3:00 mark.

World Science Festival 2009: Bobby McFerrin Demonstrates the Power of the Pentatonic Scale from World Science Festival on Vimeo.