I came across this really useful list of Electronic Music Genres from Wikipedia. With rapid increases in styles and unclear labels of Electronic music (in my part) over recent years, it was becoming difficult to accurately clarify certain styles within their respective genres.
The list classifies the genres and sub-genres into “at least” more definable groups, which means I can dispense with genres in iTunes from “Funky Cool Breaky Beats” and “Man! that’s some mega chilled track” to Speed Garage and Melodic Trance respectively. :)