Getting Back Deleted iTunes

If you lose all your music off your iPod, what are you supposed to do?
1) Reload your songs from iTunes from the machine you downloaded them on
2) If you used Wifi, then the sync feature you should see a list of what you bought and restore this way
3) If you didn’t sync-up you most likely lost your songs and have to buy them again. In the future if you can get a service like Mozy or MobileMe to back-up you files so it doesn’t happen again