i'd guess it's because wind-up doesn't have an agreement w/ any of the services you mentioned (try searching for finger eleven, evanescence, submersed, alter bridge, etc... just to see if that might be the case)... i read recently in rolling stone that there's a number of popular old-school bands that aren't available online (presumably for this issue of distribution rights). i think led zeppelin was one, the beatles were another (tho i think they might be available now).
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