Every now and then you see an idea that makes you take a sharp intake of breath. Wahwah.fm is an app (currently in beta but soon to be more widely available) that enables you to listen to your music but also broadcast it at the same time, so other wahwah users can tune in live and listen to the same music you're listening to ("It's like running your own mobile music station").
So people can connect up, post messages, bookmark stations, and use sound to describe what they're upto in a way that is reminiscent for me of what Instagram does with photography. There's the music discovery part of this of-course, but I think it's the combination with location that is most interesting. Creating playlists that can be found by your location. Shared audio experiences. Soundtracks for locations. Walking through a city and discovering it through its music. A totally different way to 'navigate the musical abundance'.
They've started by integrating with the Soundcloud API, but it's a very scalable idea with some commercial potential (brands+people+location+music = interesting) that's already won a bunch of awards including, just now, the elevator start-up prize at this years NEXT conference in Berlin. I've posted a short (and rather understated) NEXT interview with the founder Philipp Eibach, below. It's a rather cool idea.