When there are multiple artist in one album e.g. a movie soundtrack or someone featured in the album. Musicbrianz seem to create a whole new folder for them instead of dropping the track in the same folder.
this is my current setup
File naming = %artist%/%artist% - %date% - %album%/%tracknumber% - %artist% - %title%
Change date to year only = $set(date,$left(%date%,4))
Leading zero from track numbers = $set(tracknumber,$num(%tracknumber%,2))
multidisc compilations = $if($gt(%totaldiscs%,1),Disc %discnumber%/,)