I would pay for a music metadata service that stored tags, ratings and playlists. It wouldn't even have to provide music streaming at all, as long as it could i

I would pay for a music metadata service that stored tags, ratings and playlists. It wouldn't even have to provide music streaming at all, as long as it could integrate with YouTube, Spotify, Apple, Dropbox or local files. Something that treated a playlist with the same respect as an album, capturing creation date, comments, tags, author. If I lost my whole music collection tomorrow, I could recover the actual tracks from Bandcamp/7Digital/rip etc. But my custom tags and ratings that I use to generate playlists, and the history of saved playlists found back over 15 years, would be impossible to recover.