This is an excellent idea! And I'm about as rare as they come to say something like this.

I think the challenge you're going to face is distribution and awareness though. I'd seriously try to invest your time in building something along side other platforms that can help in that arena.

I don't think there is anything readily available yet, but there will be soon. STEEM plus a storage blockchain like Storj/Sia, LBRY, and others will surely lay the groundwork for this.

How do you plan to address the DRM issues?

Honestly, a music centric solution where reputation/karma, distribution and music library integration with popular DJ apps, or even just a "cloud bucket", possibly built on Storj, would probably be great.

I just wonder how you're going to ensure that people are going to get paid on the contracts and the songs won't leave and be shared outside the contract.