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It's rare for Apple's media store -- which recently celebrated an amazing 10 billion downloads -- to suffer from technical difficulties, but it seems it has fallen foul of some kind of as-yet-unconfirmed issue.
Here at Mashable, we've been testing the service and although a search can be carried out successfully (if slowly) trying to click through to specific items returns an error message: "We could not complete your iTunes Store request. An unknown error occurred (504)."
It seems many Twitter users are having similar problems. Recently tweeted iTunes-themed comments include, "What's wrong with iTunes today?" and "iTunes Store not working/slow. Anyone having the same problem?"