Math and Music

I've had more math & music on the mind lately, partly because of some student projects I am advising.  I'm interested in the possibilities for configurable music instruments, among other things.  So far I have begun to implement some ideas here:

http://www.d.umn.edu/~mhampton/vmachine1.html

This is likely to change over time, currently its just a work in progress.

Seems an appropriate time to share some great educational videos. The federal department of education might be about to embrace the Dark Ages, but you don't have to!

If you know of others of this quality please comment!

Great for middle schoolers, science, English, history and philosophy:
https://www.youtube.com/user/crashcourse/playlists

Biology, again good for middle schoolers:
https://www.youtube.com/user/AmoebaSisters

Math and music, all ages (maybe over 8 or so):
https://www.youtube.com/user/Vihart

Math (high school+ ?)
https://www.youtube.com/user/numberphile

Chemistry, all ages:
http://www.periodicvideos.com/

Science and engineering:
https://www.youtube.com/user/1veritasium/videos

Math, this one is pretty deep but great:
http://www.3blue1brown.com/