Bobby McFerrin demonstrates the power of the pentatonic scale, using audience participation, at the event "Notes & Neurons: In Search of the Common Chorus". ...
Extra impressive considering what dinopad10 mentioned in the comments:
This is made more amazing after realizing he’s moving left to right in the traditional low to high pitches in the audience perspective, but contrary to his own. In other words, as he moves to HIS left, the “notes” raise in pitch, but this is to the right in the audience perspective, so he’s switching it in his own mind.
he played the crowd like a fiddle
Extra impressive considering what dinopad10 mentioned in the comments: