JSYK there's a brand-new ishkur's guide to music online, today: http://music.ishkur.com/
If you've never heard of ishkur's guide, it's an old 90's flash applet where somebody tried to describe most of the existing electronic music genres of the time, and some of their history, with listenable samples of music for each genre.
This new one is STAGGERINGLY huge and detailed, please check it out if you like literally any electronic music