How To Find Hidden Purchased Music in iTunes Library. How to find hidden files of purchases of music missing from your files. Simply
Go to iTunes Store, click on your Account (info) and sign in.
Click “Account Information”
Now, scroll down to "iTunes in the Cloud", click on “Manage" (to the right of Hidden Purchases & click on “Unhide All”
Then re-download your missing music. This was the best method for me and it’s perfectly legit.
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