[InvisaGod]

Not sure how else to explain, when I open Artist list, it shows The Black Keys - Turn Blue album cover for the first 5 Artists, then blank, then another 3, then more blank etc.

All this Music is also being used in iTunes and 95% of the Artists / Albums are proper. Thoughts?

[DaveBlake]

Need a bit more to go on please.
What version of Kodi?
Have you just scanned this music for the first time, or did you install a new version of Kodi over an old?
Do you have any NFO files?
What is your folder structure used for your music files?

But, absense of any information, the first thought is corrupted thumbnails.