great work. May I come with one suggestion.
The main problem in comparing with sites like dribbble and devian art is that you are dealing with two very different senses.
One of them you optimize i.e. you can learn to quickly read through hundreds of pictures in a matter of seconds.
With sound/music there is no way to optimize for faster listening. 10 seconds is going to take 10 seconds.
This means peoples browse frequency is going to be much lower.
So I had an idea.
Why not start with a time limit of say 10 seconds or maybe 16 bars or maybe even less. That way it forces the musician to really cherry pick what part they want to showcase.
If something gets upvoted that musician earns the right to have longer and longer sound samples.
That way you will force the users to listen to more and upvote if they want to hear more.
Maybe that's a way to get some traction going.