Pandora

I've been checking out an Internet build-your-own-radio-station site called Pandora. Once you enter an initial "station" (artist or song) it goes to work suggesting others based on your preference for that kind of music. You can accept or deny the suggestions and build a list of your own radio "stations" (artists or songs) to listen to whenever you log on. It's based on the Music Genome Project -- analysis of music based on hundreds of unique markers (acoustic, folk, female, major key, minor key, etc., etc.) It seems to do a good making suggestions. And, it's free.