A few files are Youtube rips (as its the original source or best source)
They are noted (YT Rip) when it's the case

Most folders are self explanatory, I'll add:

Brothers is anything with the Jackson 5/Jacksons
Also a few other things from the same era, as I just didn't have the patience to classify it

Remixes is different versions of tracks, this includes radio versions etc.

Special is anything that couldn't be placed in the other categories

Rare + Unreleased is MJ songs that are mostly ones from Xscape, The Ultimate Collection
and unreleased material that leaked over the years