My son decided to make iTunes work better, so he thought he’d save time and manually move everything. As soon as he told me, I knew from experience that was not right path to take. His intentions were good, but we all know how that turns out. Especially when you can get help here and learn how to do it correctly.
What he did was move all music files into Music\iTunes\iTunes Media\Music from:
Music\iTunes\iTunes Media - About 70% of the music files were here
Music\iTunes\iTunes Media\Music - Appox 5% were here, but it had ALL of the Artist directories. Most were empty
Music\iTunes\Music - The rest of the files were here
This library was manually manipulated when I transferred the music from a desktop to a laptop a few years ago This is where I spent a Sunday trying to repair what I had done. I kept consolidating and organizing before I had everything where I wanted it. iTunes was trying to help, but I did the same thing my son did and tried to wing it.
So, how it sits now is “All” music was manually moved into Music\iTunes\iTunes Media\Music folder along with Books, Movies, TV Shows, Home Movies, Automatically Add to iTunes, Downloads, Mobile Applications, Tones, and Voice Memos
In Music\iTunes\ - In here we have four directories - Album Artwork, Apple Music, iTunes Media, and Previous iTunes Libraries. The iTunes Library, iTunes Library Extras, iTunes Library Genius, and the .iTunes Preferences .plist are in here as well
In Edit> Preferences> Advanced it has C:\Users\Username\Music\iTunes
(All three check boxes under folder location are un-checked)
When I reset it, it changes into the C:\Users\Username\Music\iTunes\iTunes Media, but it doesn’t change. I can go back into preferences and it’s back to the same thing I was before.