How does the history of popular music help us understand where music is going as a business? As Artistic statement and Politics?

Popular music obviously sells. We hear the same song on one radio station and hear it at the same time, on a different station, then we hear it again twenty minutes later. What we can learn from the history is what people like. By making a song and putting it on MySpace or YouTube, we generate business for that company because we are listening to it constantly. When we are watching television and that song comes on the show as a background song, we want to keep watching it to see what happens. And with new shows like American Idol we hear the popular songs being sung by new people then go and buy their songs. It seems by simply promoting a song that we see and hear constantly, we make it popular. Now many artists like the Beatles have made their first few albums all about love and a good record but then they realize that they have become popular and sing about what is important to them. Young girls everywhere, listening to them, believe what they are saying. It is easy for us to believe a popular artist because we love them and fortunately artist like Jay-Z or Radiohead actually sing about things that matters to them. By doing this they are able to have their own statement without singing about trying to ask a girl to dance with them. They actually sing about things that matter. When it comes to Politics I think people will believe what their favorite artist will sing about or discuss. We need to make up our own minds.