Extraction worked well enough, modified
genreEstimator.pl to use freedb as source too. Still have no data for some artists though, will have to be more ruthless with collapsing of things like "artist A with artist B".
Came up with a canonical genre list, mostly stolen from AudioGalaxy, with some embelishments by me to the Electronic section. Will have to map everything else to one of those. Dreading to count number of distinct genres in the database.