My client has a radio station and he needs a tool to find out the most viewed music YouTube videos by musical genre. He needs this in order to find new songs that are having success on YouTube but are still not on the radio. Does anyone know if such a tool already exists? If not, is it possible for a programmer to create it? I guess sorting the results by musical genre would be the challenge, as YouTube does not offer subcategories within the music category. Also, does anyone know if it's possible to find out itunes best sellers by genre?