In the Tony Williams post yesterday I touched on the idea of the historical evolution of the drum set. Here is a longer explanation of that concept from the introduction to my forthcoming book "Melodic Syncopation":
The drummers are arranged chronologically by date of birth, and as you proceed through the book you will see how each one both explores new ideas and techniques on the drums and also refers back to earlier drumming styles. In general, the trend in jazz drumming moves from a relatively strict supporting function, with a limited focus on specific parts of the drum set (Papa Jo), all the way to an almost continuously improvised leading function, with a nearly equal treatment of all parts of the drum set (Tony Williams).