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So I finished transferring everyone's song ratings to the new Musicbrainz database. Great news, but one little caveat. Only 20% of the songs had equivalents between the old Freebase data and the new Musicbrainz data!

With Freebase I used a nice and complicated system to figure out what was a unique song (all the different live versions of a song aren't really different songs, but a cover by a different band definitely is). With Musicbrainz I simplified it by looking at works instead of recordings, but works is a rather incomplete dataset compared to recordings, hence only some of the songs have equivalents.

To get the rest of the song ratings transferred I'll make use of the recordings as well. Time to look at the old complicated system again :)