DESCRIPTION:
Dum esset Rex, by Francisco Guerrero (composer), with animated score.

FAQ:

Q: Who is Francisco Guerrero (composer)?
A: A Spanish composer of the Renaissance. You can read more about him here: http://en.wikipedia.org/wiki/Francisco_Guerrero_(composer)

Q: What do the colors mean?
A: Each pitch class has its own color, chosen by mapping the musician's "circle of fifths" to the artist's "color wheel". I choose C to be blue. This is YouTube user Smalin's invention. You can read more about it here: http://www.musanim.com/mam/pfifth.htm

Q: How did you make this animation?
A: With a program I wrote in Python. I also used FFMPEG, SoX, TiMidity, FluidSynth, Python Image Library, and midicsv. All excellent, free, open-source software.

Q: Could you make a video of this other song?
A: Sure! Well, maybe. For copyright reasons, it has to be public domain music. Just comment below, or send me a message and I'll see what I can do.