In answer to my own question:
-------------------------- from musiconomi crowdsale faq --------------------------
Why does Musiconomi use the ETH blockchain instead of Musicoin?
The Musicoin blockchain project will not be large enough to support the required transactions, security updates and functions that will be required for the Musiconomi platform. After long internal discussions and the direction that the Musicoin blockchain is going, we felt that our end users would have a better overall experience on the ETH blockchain.
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This is an interesting answer. The Musiconomi team, which was part of Musicoin initially, said that the Ethereum blockchain was too slow for Music consumption, and that is one of the reasons Musicoin decided to start their own blockchain. I'm not a fintech expert, but I do wonder if the Ethereum blockchain could sustain several music tokens with thousands of teenagers listening to music all day. It's already slow now.
From the Musiconomi perspective, I think starting with ETH is right
for them because they plan to provide services, it looks like, for the many music blockchains. As most right now are being developed on ETH, it wouldn't make sense to do so otherwise. But even then the question remains: can the existing Ethereum blockchain sustain daily use of music at this point? If anyone knows this, please chime in.