How to update old iTunes (2nd gen iPod touch) to iPhone 5 without deleting songs?

Ok so i just got a new iPhone 5 and i'm afraid that if i plug it in onto my laptop and update the iTunes, my songs on my iPod (2nd gen) will all be deleted. This has happened to me once when i updated my iPod nano to my iPod touch agees ago. Please help! Ohh and one more question, how do you transfer or sync the songs from your iPod to your iPhone?

I think you go on iTunes on your computer and when it pops up, you click the button on the right which says "back up" or something like that, and basically everything from the iPod will be saved onto your computer. Then you can plug in your iPhone 5 and sync everything in it.

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