Transfer Music On Iphone To Itunes Library?

I have almost 800 songs on my itunes library, and around 1000 songs on my iphone. I don't know what songs are missing from my itunes library, and really don't want to manually do it. (I'm transferring iphone music to Ipod).

Is there any way to copy my iphone music to my itunes library?

Thanks!

PS. I have an Iphone 4

Added (1). If I need some type of software, please cite it and include download link if possible.

Not possible without a 3rd party program google it this has been answered before many times

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