MusicBrainz Picard File Naming scripting https://picard-docs.musicbrainz.org/en/functions/list_by_type.html https://picard-docs.musicbrainz.org/en/variables/tags_basic.html

albums.txt

$set(_year,$left($if2(%originaldate%,%date%),4))
$if(_year,%_year% )
%album%
$if($and(%releasetype%,$not($find(%releasetype%,album))), \(%releasetype%\))
 ($if2(%albumartist%,%artist%))
$if($eq($upper(%_extension%),MP3),, $upper(%_extension%))
/
$if($gt(%totaldiscs%,1),$if(%discsubtitle%,CD$num(%discnumber%,$len(%totaldiscs%)) %discsubtitle%/)$num(%discnumber%,$len(%totaldiscs%))-,)
$num(%tracknumber%,$if($gt($len(%totaltracks%),2),$len(%totaltracks%),2)) %title%
$if($find(%albumartist%,Various), \(%artist%\))

files.txt

$if2(%artist%,%albumartist%) - %title%