Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsTwelve-Tone Equal-Tempered Scaleshttp://demonstrations.wolfram.com/TwelveToneEqualTemperedScales/]]>http://demonstrations.wolfram.com/TwelveToneEqualTemperedScales/