Syncing my iphone to a new itunes will it erase everything else besides my music?

Okay I have a problem, my iPhone is already synced to an iTunes account but I want to sync it to a different one. All I want is the music and I'm afraid it will end up deleting everything off my phone like my contacts, pictures, messages, apps.i've already done it once before but i'm afraid it will delete everything because my friend tried syncing hers to a different account and it completely deleted EVERYTHING.

If the music you want has not been purchased through iTunes then ask your friend if they can burn to a cd. If bought through iTunes then it's the new music OR the stuff on your iphone

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