I lost my music when my old computer crashed and did itunes on my new computer and can get it back

i lost my music when my old computer crashed and when i got my new computer it erased all my music from itunes and my iphone 4... Please help!!!

It has always been very basic to always maintain a backup copy of your computer.  Use your backup copy to put everything back.
If for some reason you failed to maintain a backup ( not good), then you can redownload some itunes purchases in some countries:
Downloading past purchases from the App Store, iBookstore, and iTunes Store

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