How to add new songs to your iPhone without deleting the old ones?

I put more songs onto my iTunes and I want to put them onto my iPhone 4S but I don't want to delete the other songs I have on my phone please help!

All it will do is make a copy from the songs on your phone and then it will also add your selected playlist on there…

Drag the new ones to the old playlist and sync, done http://iphone.pandaapp.com/