Homless, that has got to be the best, simplest, EZ to understand explanation of wave physics I have ever heard! BRAVO!! I am printing it out and keeping it. Several years ago, I was asked to take my fiddle to a physics class to they could watch the sound on a 'scope. I wish I had had this explanation then. WOW!

PS--because of my hearing deficiency, I use a lot of sympathetic vibrations to get my intonation right on the fiddle.