This is AWESOME!
Some people who are way smarter than I am, put together this animated map , that is more like a flow chart, that recaps the last 100 years in rock. What new sliver of rock led to another, and where did the branches from that one go? It moves kind of quick your first time through, but once it finishes, you can move all over the map, and even click on each stop.
Spends some time with the map right here: http://www.concerthotels.com/100-years-of-rock