!tags.m3u is a file from the vgmstream specifications.
Global tags start with a @
should apply to the entire set as a default value when a local tag isn't set.
@album
: usually the game name@company
: map to either company, copyright, or publisher@artist
@ripper
@tagger
@year
@source
@albumartist
Local tags start with a '%' and override what's set in global tags, if any.
%artist
%title
%album
%performer
%composer
%comment
%genre
%track
%year
%date
Global commands start with a $
and changes the tag parsing behavior.
$autotrack
: auto-increments%track
for every invocation$autoalbum
: directory name is value of%album