Not sure if anyone is interested in the other parks but I've just come across a set of sites, 2 of them are streaming music from the Universal and SeaWorld parks. Not really my sort of thing but some people might be interested
magicofseaworld.com
magicofuniversal.com
They do also seem to have a magicofdisney.com but it's no-way near as good as Subsonic and it doesn't look like it's setup yet.
Universal / SeaWorld Stream
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