How to add songs to my iphone by itunes without losing my old songs?

I've had my PC reformatted since it had worms and couldn't save my itunes. It got deleted and now has none of my old songs, I want to add new songs to my iphone but if I sync it and sync music won't all my music be replaced? I have over 300 Music. How do I back it up

In the settings for your iphone in itunes you should be able to check a box which says 'manually manage music'. Then your phone won't sync anymore but you will be able to add new songs by dragging and dropping.

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