Khan/khan-exercises — pull request #5704 by mjptak (2011-11-07 03:33:54+00:00)
Title: add training exercise-music_root

This is not for formal review for two reasons. First off, it is off topic but such is the work of volunteers. Second the coding is less than marginal. Still It or something like it is a real use of the radical where the note A below middle C is 440 Hz. I try to make creative use of the Bengineered movable dot which has for some of us sends us back to the days of singalong when you followed the bouncing dot.