Samsung doesn't need all of this data because it already has it. Looks like Jay-Z's people pushed this as a term in the giveaway to get more value out of the deal. i.e. marketing to 1 million fans.

That said, there's nothing really nefarious here. Users accept a standard dialogue to access the app that exchanges their data and contact info for music. Making someone tweet for lyrics is kind of lame but it's still the user's choice to do so.