[Juice]

How can I swap the contents of 2 tag fields?

Example how to swap TITLE and ARTIST:

Create a new action in an existing action group or make a new action group.

Action type: Guess values
Source format: %title%~%artist%
Guessing pattern: %artist%~%title%

Note: The ~ sign is just used to make a separation between the two fields, you could take any other sign that does not appear in your fields, e.g. ˘ or an extended unicode character like ∞ or ∑ (v2.33 or higher required)

http://forums.mp3tag.de/?showtopic=980