Since we're on the topic, can anyone tell me how to make foo_uie_albumart look for album art in the parent directory of the .mp3 file if there is none in the directory itself. For example with multi disc albums I have a folder for each disc and the album art goes in the album folder so I don't have 2 or more copies, so it's like this:

I guess I just need to add another line to sources under the top line or something kind of like this:
$replace(%_path%,%_filename_ext%,)folder.*
$replace(%_CODE TO LOOK IN PARENT DIRECTORY HERE%,%_filename_ext%,)folder.*-match:$replace(%_path%,%_filename_ext%,)*
-components\default.png
??
But I have no idea what to actually put.
Thanks in advance.