How to i get music off my new computer onto my iPhone 4s?

Okay so i had a new computer that my iphone was regestered on but then when we moved we lost a cord to it so that computer no longer works, so i got my old laptop out and reset it and my sister put some music on this itunes and i want it on my phone, so how do i get music off a different computer?

Sharepod, all you have to do is pick the songs you like from your friends ipod that you would like to have on your ipod, and then just click copy to computer, then you pick where to copy them, and you place them either in itunes, or in sharepod(i recommend using itunes for this part) then just sync

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