Extracting and moving content from tags into other tags

Support
6

You could try it with this 3 Actions with Action type "Format value":

1.) Field: ALBUM
Format String:
%ARTIST%

2.) Field: ARTIST
Format String:
$regexp(%TITLE%,(.*) _ (.*),$2)

Short explanation: Create 2 capture groups, one with the content before space underscore space and one with the content after space underscore space. Put the second content into the field ARTIST.

3.) Field: TITLE
Format String:
$regexp(%TITLE%,(.*) _ (.*),$1)

Short explanation: Create 2 capture groups, one with the content before space underscore space and one with the content after space underscore space. Put the first content into the field TITLE.

You can put these 3 Actions in 1 Action Group and it looks like this:
image