How to sync my iPhone to my new laptop without deleting my music?

I just got a new laptop and want to download some new songs / rearrange my old songs onto different playlists. However, I can't do anything with my music because my iPhone isn't synced to my new laptop. If I sync it, all my old songs will be deleted, and I don't have any songs on my new computer. Is there any way I can use iTunes on my new computer without deleting all my songs?
And I'm not very good with computers, so if you could explain it simply, that would be fantastic.

You must jailbrake your iPhone!
And then you can use any software, for example, iTools to load any files on your iPhone!

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