I listen to the free version of Spotify fairly often, often while working in fact. Right now even. Anyway, I have to deal with a few ad breaks every few songs I think. It's not that bad, but it made me wonder how much an ad through Spotify would be, and not one of the static ads, I mean an audio promo that plays between the songs. How much would an ad like that cost versus just a static or animated ad on their player?