Jelly Roll Morton - New Orleans Joy 
I had no idea things got this funky in the early days of jazz, but this one has me making faces and breaking my neck like I was Jay-Z hearing the "Dirt Off Your Shoulder" beat for the first time. There's even a hint of boogie woogie-esque left hand in the mix, which I find difficult to resist. For millions of years people were making music of all kinds, and then one day we figured out how to record, and this just happens to be where we were at. A sudden new beginning marked atop a mountain of musical evolution.