Really great article.
I agree that Muse and peertracks seem to be in the top league as far as blockchain based music applications go that I've seen so far. Really looking forward to the launch!
I think Spotify is really overvalued. I recently came across an article during my research that mentioned the massive loss they make as well. I don't get all these massive companies operating with substantial losses and being so highly valued, everyone seems to go for a: be the biggest, become an effective monopoly like google and amazon; it's crazy.