It wasn't high on the user count, compared to Spotify (and probably Pandora) but Rdio was __the__ music streaming service for any music nerd. Their recommendations was better than Pandora (probably why Pandora bought them out); UI/UX was better than Spotify (ability to browse on web while listening on phone was a feature I miss greatly); the breadth of information (on the site / app) available about a song / album / artist / recording beats anything I ever encountered outside of a now shuttered 'pirate' library.

The last one is something that no other service I have encountered even considers (maybe Spotify has some recording info?). Also their API was a joy to use and very helpful support staff.

Sorry for the rant, especially when comparing your observation to something that no longer exists.

Edit: but one can hope that Pandora will put all of that wonderfulness together one day in to their own product.