Depending on the station you have many options. AOL Radio is for a lot of CBS owned stations. I Heart Radio is for some Clear Channel stations. There are numerous apps for SHOUTcast stations (FStream and FlyCast are free, CastCatcher, Tuner, etc are not). Pandora and Last.FM are more tailored for what you like to listen to. Just grab a bunch of free ones and see what fits your needs.