Yet again, here's another pointer to Ishkur's site. Click on the sparkling new "tutorial", which is both entertaining and informative. All in one! Isn't the intarwebby great?
http://www.di.fm/edmguide/edmguide.html
Edit: Probably the best thing on the whole thing that puts an end to this argument. (I think.):
"The real inventor of electronic music was Grog, who in 65,000 BC started banging his stick against a rock in a rhythmic, synchronous repetetitetitetive motion, thereby producing the first tribal track. And what, pray tell, is so electronic about that? Well....he was struck by lighting at the time. It really gave an analogue warmth and fullness to his sound."