Audius - Empowering Creators
audius.co
Audius is a music streaming and sharing platform that puts power back into the hands of content creators.

It seems to be open source: https://github.com/AudiusProject/audius-client

Edit:

Mmm. Basically they’re a soundcloud/spotify platform based in a blockchain protocol in terms of monetization, that’s it. Only their client (Another React app) and protocol (ethereum) are open source (Apache License 2.0) the rest is the same: Another privative/centralized music platform with DRM.

At the moment the only real federated/decentralized music platform is Funkwhale. Or Jamendo which is centralized but all its content is under Libre/Free copyright licenses like Creative Commons.