If i sync my iphone to an empty itunes will the music from my phone copy to itunes?

I had my laptop re imaged so everything got wiped, i did back everything up before but i was wondering if i sync my iphone to an empty itunes will the music from my phone copy to itunes? Or will it erase my iphone to an empty phone:-\

Assuming you have an iPhone. It will erase your phone by syncing it to the empty computer. I'm not sure how to fix this. But that's your answer