How to back up the tunes on my iPhone to iTunes on my computers?

My old notebook up an died without my backing anything up on it. My bad. The only thing, though, I had to worry about was my tunes. I'd spent a lot of time and energy uploading a bunch of my old cd's. They have survived on my phone. But now, last I heard, whatever was on your iTunes on the computer is what went on your phone. Which, at this point, would mean nothing. Is there a way to upload my phone tunes to the computer?

Synchronize it?

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