That's not all they hear. But I think it's more a matter of how much you are exposed to a certain type of music. In the beginning I didn't like electronic music either, and much of it sounded the same. I used to be into alot of 60's psychedelic rock. But now, it's the opposite, alot of that old music sounds the same to me instead. I also notice this when I discover a new genre, let's say 'electro' that I started listening to recently, but the more I listened the more I was aware of the small varations between artists and their songs.