Further to Ian's comment about doing the association thing even if the metadata isn't 100% there, it would be a phenomenal opportunity to have all of us crowdsource improvements in the associations.

The sites that currently do this are doing it at a very crude level. There's enough (at least at the album level) meta data in MDMS to do it far better as is, and with crowdsourced refinements, it might get incredibly good.

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