You might consider using a beets query to find those. For example, you could use:
$ beet ls -p title:feat
to get the paths to audio files and then pipe it through `dirname` to get the enclosing directory:
$ beet ls -p title:mix | while read -r line; do dirname $line; done
and, finally, pipe that into `beet import`:
$ beet ls -p title:mix | while read -r line; do dirname $line; done | xargs -d "\n" beet import
There’s more on using `xargs` with `beet import` in this thread:
https://github.com/beetbox/beets/issues/422
Good luck!
Adrian
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