Correct tags from tags.

[Krist]

I would like to be able to set some tags to (part of) other tags. The reason is the following.

I have a lot of classical music, and titles are formatted according to the Misicbrainz convention:

Symphony No. 2 in B-flat Major, D125 - I. Largo. Allegro

I would like to split that in “work” and “movement” (by splitting on -), and put the values in “custom1” and “custom2”, so I can use them to create subdirectories.

This is so that I can organize my classical music connection like this:
//()/-

[Krist]

On second thought this is probably to complex to completely automate. Currently I am exporting tags to Excel and doing the manipulations I need there.