After updating the software on my iphone to 4s i lost all my music

I only download my music from my phone and have never had a computer to sync my music with. I recently just purchased a mac but it has all my sons music on it. So when I went to update my phone I lost all my music, I thought it had synced with my itunes but i guess not, is there any way i can retrieve my music without having to pay for it all over again?

The iphone is desigend to be sycned to a computer regularly.  It said that it would delete everything when you updated.
If you have failed to bakup your music, not good, then redownload it:
Downloading past purchases from the App Store, iBookstore, and iTunes Store

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