A good alternative I can recommend is "The Sixty One".

While it's probably not directly as you described, it's a brilliant way of finding new and (most likely) unknown music, the flow is great, and it has quite a bit different styles. On top of that, it has a funky optional quest-system, that gives it a rather unique touch.

To summarize, I'd add it as this, hope that helps:

The Sixty One (http://www.thesixtyone.com)

Pros:

• Nice way to find new music
• Great radio-system
• Lets you save music, and have different playlists
• Option to donate money to some of the artists, and upvote songs.
• Some tracks are available as free/paid downloads
• Fun and different quest- and achievement-system

Cons:

• A bit tricky UI, that takes a while to get used to (an older version is still running here: http://old.thesixtyone.com/ It might be easier to get around)
• Has some various bugs from time to time