This was originally relegated to a tweet, but it deserves to be elevated to a blog post. Bobby McFerrin, at the World Science Festival, demonstrating the pentatonic scale. A rare combination of joy, passion, and teaching. I dare you not to smile at the 0:42 mark.
World Science Festival 2009: Bobby McFerrin Demonstrates the Power of the Pentatonic Scale from World Science Festival on Vimeo.