2 Options: Option 1 is fast and doesn't require u to install any new programs but its a bit tricky, option 2 is easy but I only use if I want to reorganize my music because its gives you the option to automatically rename each file to a standard format.

Both require this same first step:
When your iPod is connected to your PC iTunes opens up right click on the iPod in iTunes and go into the preferences and then make sure the checkbox for "Enable Disk Use" is checked, if not then put a check in it.
 

Option 1: No program needed only Microsoft Windows & iTunes:

Step 2:
Open 'My Computer'
>Find and open your iPod in 'My Computer'
>>Then on top of the explorer window click on 'Tools' then 'Folder Options' then click on the 'View' tab on top.
>>>Move the radio-button to: 'Show Hidden Files and Folder' then click OK.

Step 3:
There should be a hidden folder which now shows up called: 'iPod_Control' Open it.
>Then open the music folder, you should see a bunch of folders starting with 'F' your music is in those folders

Step 4:
If you want to copy all of the songs together then click on the search icon on top, a tab should open up on the left for searching.
>Click on 'All Files and Folders'
>>On the bottom click on 'More Advanced Options'
>>>Put a check in the checkbox called: 'Search hidden files and folders'
>>>>Now go back to the top and type in " *.* " (star dot star) in the 'All or part of the file name' field.
>>>>>Click Search.

Step 5:
The results should show all those 'F' folders as well as all your songs.
>On top click on the 'Edit' tab then click 'Select All'
>>Now hold down the 'Ctrl' button while highlighting only the 'F' folders, this should deselect them and only leave the songs selected.
>>>Click on the 'Edit' tab and then click 'Copy', now u can paste the songs wherever u want on your computer.

Step 6: (Optional)
To add the songs to iTunes if their not already there, if they are do not re-add them it will make doubles.
>Open iTunes.
>>Click 'File' then 'Add files to library'
>>>Find where you copied your songs to and select them.
>>>>iTunes should automatically add them to your library.

Option 2: Download: iPod Agent

Step 2:
Download and install iPod Agent using this name & serial number:
Name: Richie Hedaya
Serial Number: IPSAGNT000-5M0F-MK9F-03Y0-0H53-11F0

Step 3:
You can transfer all your songs to iTunes automatically and it also gives u the option to rename each file with a standard like:
Artist - Song.mp3