HT4859: iCloud: Backup and restore overviewLearn about iCloud: Backup and restore overview
Currently Being ModeratedApr 24, 2013 2:54 PM (in response to Rooooo123)
If you are using iTunes Match, your music should already be in your iTunes library. If you aren't, you can transfer music purchased from the iTunes store from your iPod to your iTunes library by first authorizing your computer for all Apple IDs used to purchase the music in Store>Authorize This Computer, then connecting the iPod to your computer and in iTunes going to File>Devices>Transfer Purchases.
If you no longer have the old iPod, you'll have to redownload your previoulsy purchased music from the iTunes store, as explained here: http://support.apple.com/kb/ht2519.