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I started with my iPhone iTunes connected through my laptop ( windows vista ) now I brought an iMac I want to transfer my music on my iPhone and itunes to the Mac iTunes

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When I connect my iPhone to the Mac iTunes it tells me my phone is already synced to another iTunes , I don't know how to add the music on my iPhone to the Mac iTunes .. My laptop windows vista iTunes will be deleted once I know how to transfer the music over the the Mac ,,, hope someone out there can help
The best answer: use the instructions in this article here to transfer your library to the Mac.
your iDevices will simply continue syncing (now with the Mac's iTunes library) as if nothing happened.