Now, I'm sure this will resonate with the artist, but the problem you have is the same problem faced by many sites I've seen before. It's partly a branding issue (on the front page, all I see is a globe) and a distribution issue. Do I have to post a link to mvsic somewhere in order to get people in the door? If so, what are the benefits of sending them to mvsic rather than somewhere like Bandcamp?
I'm not saying that Bandcamp does what you guys do, better (I'm sure mvsic is awesome, and I'm going to delve into it further after work), but it's not clear what value it actually brings to me as an artist.
So, here's some things you can do now.
* Make the front page friendlier. Pictures of the product in action. Keep it minimal, that's a great thing you have there, but just take a think about what someone wants to see when they visit mvsic.co.
* What IS your USP? Give me it in plain english. (It's definitely a SP but not sure how U it is!).
* Maybe think about offering a free tier. I know you've put a reason as to why there isn't one, but I'd urge you to experiment with offering a free trial for a certain amount of downloads, restrictive features etc. For instance, make your account FOR FREE , after first 50 downloads prompt the user to subscribe to your service.