DJ Rashad, Chicago footwork pioneer, is pretty good at making beats. Here's an example, in which he makes a beat in 10 minutes.

The footage, filmed in spring 2012, is taken from I'm Tryna Tell Ya, a documentary focusing on the Chicago footwork scene and its various influences on music today. DJ Rashad was a huge part of that scene, but unfortunately he died earlier this year (but it wasn't a blood clot, it was drugs).

Watch the 10 minute Beat This challenge below.

Alternatively, or also, you can watch the entire documentary here.