How to recover purchased music from itunes?

I had all my music on my computer but it crashed and had to get it sent in to get fixed.long story short, the computer people didn't fix it and it got worse and then Norton ended up fixing it.today my iphone 4s got stolen and now I have no backed up music or music that wasn't backed up on icloud.iTunes store says some songs/albums are purchased already but they aren't in my library. How do I get at least the purchased music back?

You can recover them with a professional iTunes data recovery tool.

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