The Pentatonic Scale - As explained by Bobby McFerrin

The Pentatonic Scale is is a musical scale with five pitches per octave in contrast to a heptatonic (seven note) scale such as the major scale. I don't understand that as well as I like as I am not a musician. However Bobby McFerrin is -

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