Pandora is another free web based music streaming service with an intensive music library which becomes a great tool when listening to new music based on any category. On the contrary, once a song is being played, one can’t go back to the previous played track. Its a great tool to create personalized music radio stations based on different genres. Discover new music, free of cost!
Slacker Radio is another great online music streaming player which lets you stream music plus customized radio stations. The service comes in two modes, with ads and with-out ads. Part of the service works in a way that programmed playlists are created based on different categories by the staff DJs. Different profile options are available i.e. favorites, ban (like / dislike), customization etc..
These four were our best selected. Feel free to add more in the comment box (or via contact page) and we will be more than happy to review it and ad it to the list if applicable.