Download this Song @ iTunes says YouTube

I'm wondering if this new partnership between iTunes and YouTube is driving sales revenue for both parties?

When you pull up a song from your favorite band on YouTube a message pops up in the screen asking if you want to download this song at iTunes? It's a nice application and a great place to target music lovers, but I am not sure that visitors to free content sites like YouTube are interested in paying for music...

Your thoughts are welcome!