This looks like it could be the world map off Brütal Legend. This gives a heavy clue of what to expect right from the start. What we’ve got here is a very interesting example of cultural representation, this time on the history of heavy metal and all the different music genres it spawned, complete with music playlists you can just leave playing and go on doing your thing. It’s an excellent, excellent job. Very cool.
Also, allow me to do the map dance. I do it whenever I see unique, strange, accurate or just plain well-made maps! What might the map dance look like, you ask?
*does map headbanging*