Your screenshot shows that you are still fighting with the files from the zip. Normally foobar2000 automatically notices all changes to files in Media Library folder. Have you disabled library monitoring?
I'm against that library file deletion because it should never be needed. You should have foobar2000 monitor the library locations so it sees instantly everything that happens in said directories. If the library is on a "weird" network share (something running on old linux-based software) it may not support monitoring. For these purposes the library has a rescan button. These are accessible from the right click context menu of the media library directories.
On that note your earlier media library screenshot showed that you have "..\LR_Classical" and "..\LR_Classical\Beethoven <something>" and "..\LR_Classical\Schubert <something>" added as media library locations. Just having "..\LR_Classical" is enough, all subdirectories like that Beethoven and Schubert gets included automatically. Unless if they are hidden directories. The media library excludes hidden paths.