As of lately I have been using LAST.FM to get all my new music. Their extensive library covers everything. Primarily I have been listening to Reggae Music. Compared to all other online free music services I have found this to be the best.
First you have to set up an account. Then you can pick an artist and start listening to all music by that artist are similar music. Each artist has a radio station. You can save that station as a favorite and start building you own library based off of what you enjoy. My reggae library is pretty extensive to date.
If you are into Reggae you should start with the Wackies Radio Station. From here it will lead you to people like Johnny Clarke, Hugh Mundell and Barry Brown. This can be the best start you will ever find to true Rootsy Reggae, if you don’t already know, now you know.
Keep it Rootsy.