In a trance

Here is a link to a page with a host of information on the genre of electronica music. Lots of samples to listen too as well. I've been listening to a lot of it lately on XM 82, The System. I particularly like the Trance music. (Warning: some of the text blurbs there do have some foul language.) It does a fine job of tracing the history of the genre, its underground elements, hardcore elements, the more pop mainstrem elements, etc... (The music for the Zion rave scene in The Matrix Reloaded movie was electronica music.)

Here is a page with some details on the musical elements involved. Here is another.