I really enjoy this long time Internet Station caslled Shoutcast. You can go here, type any Genre of music you like and get dozens and hundreds of stations around the world (mostly all Internet Only Stations) not broadcast to choose from. Then arrange them by bitrate (broadband stream) or how ever you wish.
I like NEW AGE and JAZZ mostly, try either of these or WORLD MUSIC sometime and see the possibilities.
I really like to listen to this as I surf or work around the house, the 128 bitrate is very nice quality, but they offer much lower and much higher rates too according to your internet connection, etc..
Here is the link to their main page, you'll see general music topics to the right categorized, but type your favorite themes and checkout the many stations available. JUST CLICK ON THE YELLOW TABS that say TUNE IN to play the station directly, the links to the right of the tabs take you to the station on the net.http://www.shoutcast.com/
- and for the heck of it, try new age, you should get about a dozen stations under new age - sometimes classical or other styles creep in there, but usually for just a song or two. Even ambient is cool too for background music, it isn't canned elevator stuff, it is wonderful relaxing music that I find very moving .
Shoutcast does have something for everyone, I guess that is what I like about it the most :)