[solved] How to list recordings that don't have a "composer" tag?

Is there a specific query syntax for albums/recordings that do not have a “composer” tag or where the “composer” tag is empty (because on the musicbrainz database the year has not been added)? Or more generally is there a syntax for a tag that is empty/nonexistent? I would like to list all albums that have tracks with a composer lacking to be able to sort them out and complete the musicbrainz database.

songs that miss a track title: beet list -p title::^$

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