Musicmap: Genealogy and History of Popular Music Genres
musicmap.info
musicmap.info
It still can largely be used, really―the tree of genres grows much more slowly in the past ten years than in the 80s and 90s.
But I don't really hold my breath: the old guide was cool because it was filled with inside knowledge from someone active in the scene, which back then meant hanging out with djs a lot. Now that the field is super fragmented and accessed more through the web, you either become a ‘music journalist’ with theoretical knowledge instead of practical (which is alright but different), or you need to be in dozens of emerging scenes, only some of which leave a trace.
In short, Ishkur old now.