The Mashtape allows you to search and play a song and then will search the internet for media relevant to the song from places like Flickr and YouTube. I think it is an app worth looking into, if you are media inclined.
So why is this on advertising blog? There are more ways to advertise than the traditionl ways. Now go create content, related to songs, there will be millions watching your products, if SongBird is a hit!