What, like Pandora, Spotify, etc is out there that I could add music I have on my phone/etc?

I've been using one of the Pandora services, but I've been getting a little annoyed with the stations (which I presume I would get the same annoyance from other services, too). So I'd like to be able to create a station and add songs that I own and that wouldn't normally be in that station. (And I know you can add artists to the...