How to sync music to different iTunes?

There are songs on another computer that i want to sync to mine. Is there any way to do that WITHOUT having to erase the songs already on my iphone? Also, i've tried selecting "manually manage music and videos" and applying that setting asks me to erase and sync.

Yeah you have to do the erase and sync to switch from automatic sync to manual.

I don't know why iPod owners insist on trying to reinvent the wheel.

The songs on the other computer are just files. Files can be copied from one computer to another using a CD-R or flash drive.

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