sorry if this is posted somewhere else but I wasn't able to find anywhere. If I could ask for Step by step instructions for newbies on how to; move artist folders into alphabetical folders - have tried this command but I don't know how to run it in mp3tag
In general: if you want to rename a folder, then use an action of the type "Format value" for _DIRECTORY.
BUT: as you do not want to rename just the current folder but also the parent folder, you will be left with empty folders after the process.
Only the current folder level can be renamed.
Also, I would apply a full path like d:\music\1\ %artists% \ %album% (%year%) \ %artist% - %title%.ext
in order to get the same starting point.
(instead of the "1" insert the regular expression)
And finally, the field ARTISTS is no standard field - there are ARTIST and ALBUMARTIST. Are you sure that you have that field filled in in every track if you reference that in your string?