tinkadoo go to LW Library window & select incomplete folder & press Explore button. The folder will open for you & you can delete only those song files you know are definitely in iTunes Music Library.

lostmusicman don't get confused by the LW playlist you see in iTunes. That is simply a playlist for the songs that still remain within the LW download folder. What you need to do is properly add the songs to iTunes so they're added to iTunes Music Library; How to transfer music to my iPod (& iTunes)

If you deleted your other music before doing this, then you could try using a file recoverer or redownload. Learn how to use iTunes by seeing the tutorial videos.