Using WMP you can do a media scan for your whole computer. This will find them.

Best solution is to move the songs out of LW's Shared folder & into another music folder. Then add that folder as another folder to share. To do this go to LW's Library window, menu File>Add Folder to Share & direct it to where your music folder is.
Now to get to your shared folder, go to your LW Library window & select either Saved Files folder or Shared & press the Explore button. This will open the folder up for you. You can then move the files to a music folder that you can use WMP to open from. Sound good?!