I saw this on The Today Show this afternoon. It is Pandora Internet Radio. You can listen online and it’s free. I’m listening to Christian music as I write this.
Description from the website:
*With Pandora you can explore this vast trove of music to your heart’s content. Just drop the name of one of your favorite songs or artists into Pandora and let the Genome Project go. It will quickly scan its entire world of analyzed music, almost a century of popular recordings - new and old, well known and completely obscure - to find songs with interesting musical similarities to your choice. Then sit back and enjoy as it creates a listening experience full of current and soon-to-be favorite songs for you.
You can create as many “stations” as you want. And you can even refine them. If it’s not quite right you can tell it so and it will get better for you.