Add support for isCompilation tag field
What started as a proprietary tag in iTunes has become something I've quite come to rely on when tagging compilation albums.
Setting isCompilation to True, combined with setting Album Artist to "Various Artists" seems to help just about every music player I've come across understand what is and isn't a compilation album.
https://developer.apple.com/documentation/ituneslibrary/itlibalbum/1809386-iscompilation https://id3.org/iTunes%20Compilation%20Flag