This may have been posted here already, but incase it hasn't, check it out!
Awesome site, I spent a good few hours on this:
http://www.mapofmetal.com/#/home

Its a nice idea done fairly well, especially the music player - its actually got a pretty decent amount of stuff per category - or at least the right bands. but i think there are some glaring omissions to the genres as well as some of the connections being completely wrong in my opinion.

Where is this from though?

No idea! Someone posted it on Facebook so I nicked it and pretended that I found it myself!!

Yeah this is pretty cool!!!