I guess it would depend (like the advertising) on what kind of demographics the population consists of. Pop music, because it is specifically designed to appeal

I guess it would depend (like the advertising) on what kind of demographics the population consists of. Pop music, because it is specifically designed to appeal to a broad spectrum of people, would have terribly nonspecific demographics. The weirder the genera, the more specific the audiance (usually), and thus higher "CPM". Where's the sweet spot? Serving music has got to cost much more than serving a jpg ad, but maybe less than or equal to a flash ad (depending on the song and ad of course). I could very well be wrong about that though.