Would anyone be interested in writing a program Add-on to sync user "scores" from TheAudioDB.com website to the kodi music library? I've put a £50 bounty on it payable to anyone who gets an initial Add-on working.
Basically theaudiodb site allows any user to rate a track with a score from 1-10 and provides an API to access these.
Example track with a rating: http://www.theaudiodb.com/track/34675922
It would be cool to sync those with your local Kodi database just like the current Trakt.tv Add-on does with watched statuses. This allows you to backup your song ratings or maybe sync with your friends.