The first one is not possible; all applications are installed in their own sandbox, meaning that they cannot do anything outside their own application. This is true for all scenarios, but certain things are allowed by Apple, such as retrieving the users image folder etc. But I'm not sure if it works when it comes to music. I do not think Apple are keen to have compeditors when it comes to their iPod.
However, I'm not 100% sure about the first one, although it would surprise me a great deal if it was possible.
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