World Science Festival 2009: Bobby McFerrin Demonstrates the Power of the Pentatonic Scale on Vimeo
http://vimeo.com/5732745

"Bobby McFerrin demonstrates the power of the pentatonic scale, using audience participation, at the event "Notes & Neurons: In Search of the Common Chorus", from the 2009 World Science Festival, June 12, 2009."

Using the audience at the event "Notes & Neurons: In Search of the Common Chorus".