ITunes is saying I have no songs on my iphone?

When I click on the iPhone icon I click on music, it has a check box that says sync so I check on it, it says I will delete all of my photos, TV shows and movie is there a way to get my songs on my computer with out deleting ANYTHING?

The subject line for your question is that iTunes says you have no songs on your iPhone.

Then you ask how to get the songs onto your computer.

Which is it? If it isn't seeing any songs, you aren't going to be able to transfer any.