As a music producer, I am waiting for this one as well. I don't have to use YT to embed vids here on Steemit. A Steempay buy button embedded within the page, and an mp3/wav file is instantly returned from blockchain land.
Maybe a Steemit/Steemq music upload page like Bandcamp could be available for artists. I don't know but this is exciting for sure!
This is something that is is not explicitly in the roadmap for SteemQ, but it is a really good idea for another app.