How to synchronize song on my iphone I manually put on it?

I have a lot of songs I have on my pc, now i also have some songs I put on my iphone from my laptop. Now I want to synchronise my iphone with my laptop, just to see how many times I played the songs I have on my ipod, how do I do that?

Added (1). To be clear, those songs I want to synchronise now, are songs I put on my iphone manually!

Have you tried plugging the USB cord into your laptop and into your phone and going on iTunes? Maybe, it should tell you. Hope I helped.