Now I buy my songs on iTunes all the time. When I see new albums released specifically in the Rock genre, I usually buy one song from that album. That song that I buy from that album, is the song that is most popular. I usually buy the song that is most popular on that particular album or in the top 5 for the artist. Yes, I know obsessive-compulsive about song choices. And lately some of these bands, in the rock genre, just keep switching up on popularity of a song everyday. So I wait until it settles down. There are some songs from a particular album that I will like and want but only get them because of song popularity or in top 5. How does iTunes song popularity work? Sales of certain songs? Sorry about being picky, I just like to save money and enjoy the (best?) music I listen to.