Yup, the tag space is there. They just need assignment to standard actual attributes, software to write/extract/append them, a server to receive and distribute them, and player software (even if only for the empeg) to use them with enough smarts to allow for variance; with an optional database to intelligently store them.

Someday, somehow...
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FireFox31
110gig MKIIa (30+80), Eutronix lights, 32 meg stacked RAM, Filener orange gel lens, Greenlights Lit Buttons green set