Search for iPod deleted files
Start by making sure your iPod is correctly selected in the drop down menu and hit "Search deleted files".
CopyTrans Doctor will establish the list of your iPod deleted files and indicate the number of them that are fully recoverable.
You can either choose the type of files you wish to recover or hit the "Advanced" button to select files to recover individually.
Once your selection is done, hit "Undelete".
After the recovery, CopyTrans Doctor will indicate how many deleted files were found and how many were recovered.
You can now open the destination folder you previously chose for the recovered files and enjoy them again!
Note: files in the destination folder have cryptic names. Your best bet is to add them to iTunes (iTunes->File->Add file to library), which will add them to your iPod with their name, artist, album, etc.
For more technical information on iPod song recovery, please visit CopyTrans Doctor FAQ.