How Do I Find All Of My Music That I Bought ?
How do I quickly restore all of my music ?
iPod Nano (7th Gen)
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First look on your hard drive in case it is still there.
If not there, get it from your most recent backup.
If you don't have a backup, you can usually download fresh copies at no charge by following these steps:
http://support.apple.com/kb/ht2519