If you not have a backup you may be able to get some info off the restored iPod by:
- Maybe from the restored iPod via How to perform iPad recovery for photos, videos
Wondershare Dr.Fone for iOS: iPhone Data Recovery - Wondershare Official
http://www.amacsoft.com/ipod-data-recovery.html
iPod recovery software to restore lost music files
With backup:
To restore from backup see:
iOS: Back up and restore your iOS device with iCloud or iTunes
If you restore from iCloud backup the apps will be automatically downloaded. If you restore from iTunes backup the apps and music have to be in the iTunes library since synced media like apps and music are not included in the backup of the iOS device that iTunes makes.
You can redownload most iTunes purchases by:
Downloading past purchases from the App Store, iBookstore, and iTunes Store