http://www.youtube.com/watch?v=Xc4NIZlYKyo This series of lectures by John Crooks is both extremely interesting and a bit nerdy. Music notation, conventions and theory evolved over the last 2000 years, but was largely lost for almost a thousand of those years,...
A cute little video featuring a cool frog (who looks like he can use some time in the gym). "Charlie" demonstrates the notation names of the white keys on the piano.
One of the singular developments of Western music was to prefer flexibility and an integrated harmonic system over pure harmonies. Bach understood the ramifications and laid out the possibilities for the ages....