Eric Lippert has an incredibly interesting five-part blogpost about the mathematical essence of musical theory, along with some pretty nifty demonstrations. I've dabbled a little in the more practical applications of musical theory before (writing wave and module players and some basic software synths) but honestly have never been really interested in its mathematical/physical aspects.

This, ladies and gentleman, is interesting shit.

• Desafinado, Part One: Eric Continues His Obsession With The Greeks
• Desafinado, Part Two: A Perfect Pythagorean Tuning
• Desafinado, Part Three: Too Many Fifths
• Desafinado, Part Four: Rolling Your Own WAV Files
• Desafinado, Part Five: Getting Down Without Hitting The Bottom