Those of you who are into pentatonic scales --- the basis of everything from traditional to folk to jazz to blues to Debussy --- may find this interesting: http://www.guardian.co.uk/science/punctuated-equilibrium/2010/dec/17/1 Speaking of which: How many of you remember when Orff was all the rage in the early 1970's? John -- John S. Erickson, Ph.D. http://bitwacker.com [log in to unmask] Twitter: @olyerickson Skype: @olyerickson