Just saw the beta, love the idea.
With Soundclouds situation at the moment you have an opportunity, you should totally focus on the music platform in first place.
Care about integrating the Currency later, just set up the streaming service, no matter how bad the performance will be right now, you can buy server capacity later, when it is up and running.
And you need Artists, much more artists. I, as a music maker, would love to upload my stuff (some of it isn't THAT bad: https://soundcloud.com/despate). 
Keep it up, this can be the next thing.