Rather, I think you'll find it easier to scan the tag lists for the ReMixes under each tag. In theory, these tags should have overlapping results, giving you more precise information to work with, akin to the way Pandora has its massive network of tags.
So if you want something that's downtempo, jazzy, and contains acoustic guitar, strings, and saxophone, you search these tags and find overlapping results. Rather rudimentary compared to Pandora's crazy system, but it's a start.
And to answer your question, the tags are pulled from the corresponding comments thread for each remix. As far as I can tell, there are no tags directly on the */remix/OCRXXXXX/ pages.