Yes, that IS the dude who sings "Don't Worry, Be Happy."
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.
World Science Festival 2009: Bobby McFerrin Demonstrates the Power of the Pentatonic Scale from World Science Festival on Vimeo.
Comments
What is remarkable to me is all the people needed was just one note and then regardless of where he went they could (with the help of the whole community) discover what note was the 'correct' note for that occasion.
I am not advocating for individual relativism but this sort of thing really calls into question the idea of a one universal truth (or in this case pitch).
The people may not have had perfect pitch individually, but collectively they could sing and dance.