Signed up as musician in order to help a bit, However, app asks for way too much permissions. It's a bit problematic to allow app to post tweets and "update account" permission especially if you are logging with verified twitter.
They will need to work to allow confirmation only via social media, and allow musicians to login with email in order to get some better reach.
Just in my opinion.
RE: Making extra money with the same music: Registering to Musicoin explained (Tutorial)