Thanks to Apples archaic controls over the iPod which forces users to install iTunes ; its impossible to copy music from the iPod to a computer. While this is also supposed to stop piracy it obviously doesnt. There are a million other ways to get there and its extremely irritating when you want to transfer music from the iPod for some reason.

Thanks to third party softwares, such as the iPod Copy expert , its now possible. All the iPod users need to do is just to have iPod Copy Expert installed, connect iPod to computer, and then click the button of Copy to iTunes or Copy to Folder. iPod music not only can be transferred back to computer, but also can be imported to iTunes automatically. To help iPod users away from music-losing risk makes the primary objective of iPod-computer.com, and it has fully accomplished that by releasing iPod Copy Expert.

Source