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Say you're putting your ITunes library on your IPod, thinking, well, nothing. But then,BAM, (Insert computer problem here that erases your ITunes library). What do you do? You recover your computer and IPod. Your Itunes library is wiped out. Whether that scenario is true, or you just want your IPod's contents on your library, this method will work.
Step 1Important update!
Since I used this method, I know it works, but it's not without bugs. Recently, EVERY SINGLE file I added using this method has had a little (!) sign appear by it. When I tried to play the song, the file couldn't be found, for 2 reasons. 1, the files are on removable storage. 2, the files were contained within hidden folders, so iTunes couldn't find them. It's weird how long it took iTunes to find it out, because all of the songs were copied to my iPod, and they still are there. None of the content was taken off my iPod, but the content is unplayable in iTunes, but only when my iPod is plugged in. The solution to this is to copy the files from your ipod and put them in a separate folder in your music folder.
Simply connect our iPod, it should mount. Double-click the desktop icon, or navigate to [iPod/iPhone name here]/iTunes_Control/Music.