have you considered adding an API to upload and change user contributed data?
i completely understand why you don’t provide an API to access your core music data, reviews etc. i would love an API that allowed me to bulk upload/modify my personal data. as a longtime subscriber, i’d be perfectly happy if it was only available to subscribers.
my core music data (favorite artists, albums, songs; song ratings; playlists etc.) live in a database driven from my music files. i do not have the time to enter them manually on the site — but i’d love to have them there.
thanks for your consideration.