I tried that one.. unfortunately it can only replace tags, not add to them. I used to use the RegExp addon, but that doesn't work in MM5

Hi,
You can start by trying https://www.mediamonkey.com/addons/brow ... ap-fields/ and report what you actually missing in that addon.

It would be great to have something like the "organize files" interface, where you can set up a custom naming scheme based on tag fields, but have the destination be another tag instead of the filename.

This would come in handy in cases where you want an album with multiple artists to have the artist name prepended to the the track title with a hyphen, or appended to the end after "feat."