I've never seen that before. Thousands of files errored out and didn't scan... thus giving you a huge log that tells little - except for the fact that apparently you have a rather eclectic taste in music (as do I). Rush, Guns n roses, Blake Shelton, Amy Grant, Hunter Hayes, The Police, Hank Jr., KISS, Journey, Billy Joel, Kenny Chesney,... Quite a variety... yet all found on my system also. However, that doesn't help our situation.
I've got to give some more thought on what to try next.
I'll get back to you.