Windows 10: Some songs not appearing in WMP

I transfered some songs from downloads to music. Most of them usually show up in WMP in a few seconds, but lately it always seems to be one or two that are in the music folder but don't appear in WMP. Why does this happen and how do I fix it? Operating Windows 10

:)

 

Some WMP songs will not return to itunes library


When I try to access specific songs in itunes it says "file location not found" yet I can call the song up on wmp and listen to it.
Sometimes when I list the album in itunes the song is missing and other times it is grayed out. I am trying to put music to a video but I can only do it through itunes. Does anyone have any suggestions. I have spent too much time watching facebook videos on how to sync these two programs

 

Some WMP songs will not return to itunes library


Spent far to many hours trying to get some music that plays in WMP but does not show up in Itunes. If I look at the i tunes albums the song is there but grayed out and says "file location not found". Is there a way to have itunes and WMP sing all songs off the same "song sheet"

 

Why does WMP skip songs during sync?

I make frequent changes to my WMP playlists and sync my phone to match. There are about eight thousand tracks and set the phone to automatically sync when connected, which is about once a week. About a fourth of the songs on the sync list, however, are skipped.
Not sure what I can do about it.

There doesn't seem to be a connection to how songs are chosen to be skipped. An album with ten songs may have three skipped. The skipped songs play in WMP just fine. Nothing wrong with the files themselves. At the end of the sync list, there is a list of
songs that have problems, usually the file name was changed or the file was moved to a different folder. That list is helpful in fixing problems. But why are other seemingly random songs just skipped during sync?