Quick Fix: Get Your Music Back After the iOS 4.2 Update
The update to iOS 4.2 that rolled out last Monday went pretty smoothly, but there were many cases of people who updated to 4.2, then seemingly lost all their music. My own iPod touch was affected, but luckily there's a quick fix available.
http://feedproxy.google.com/~r/TheAppleBlog/~3/7X6yFAEr9kU/