All that complexity... I think that's why LJ lets people define their own interests and tags; that's also why you end up having to be careful when doing a search-by-interest. Even a simple thing like alternate spellings---so I seem interested both in "medieaval music" and "medieval music," for instance, and I should add "early music" and "renaissance music" there also, even though those aren't equivalent, but they are closely related enough.... etc.
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A lot to think about.