Copy from parenthesis in one field (title) to a different field (composer)

[tag]

Edit:
An easier way would be, if there's { } in the title, to copy the whole { } and any text enclosed to the composer field - then use a replace action to remove the { } and the words, mashup/remix/bootleg

I found this thread:

easy way to transfer '()' in title to comment field?

It is not clear what you want, because you speak about 'transfer' or 'add' some text from one tag-field to another tag-field. Following there are some variations about the theme ... "Copy or move text, which is enclosed into round brackets, to another tag-field" Move text from tag-field TITLE from within round brackets including brackets to tag-field COMMENT and delete this text part from the tag-field TITLE. 1.1. Action #1 Actiontype 7: Import tag fields (guess values) Source format _…

but I wasn't able to adapt any of the solutions.