MUSICOIN and OPUS aren't really competitors if they can't scale and OPUS blatantly state that they are going to figure it out as they go and MUSICOIN whitepaper states:

The project was launched on the 11th of February 2017 when the genesis block of the Musicoin blockchain was mined. The network operates under a Proof-of-Work model using ETHash as the hashing algorithm for mining and achieving network consensus. The Musicoin blockchain is a fork of the Ethereum blockchain, with network nodes and protocols configured as an Ethereum Virtual Machine (EVM), capable of executing smart contracts in a Turing-complete language. In the true spirit of decentralization and fair distribution, the project started without an Initial Coin Offering (ICO) or pre-mine or pre-allocation of funds for development.

Unfortunately PeerTracks doesn't allow you to buy music. But at least it can scale to take on any existing centralized service at launch while everyone else have to "figure it out". I think we only have to worry about the complete lack of marketing that would allow any real competitor (maybe on EOS) to take over MUSE and PeerTracks.

Hope you enjoyed the music :-)