I just wanted to give a heads up that DuckDuckGo now has “!bangs” for all MusicBrainz entities and everything else the search in the upper-right corner of the site covers:
!mb<entity> searches through "entity"s using the same terms the search box, so e.g.,
!mbdoc will search documentation,
!mbannotation will search annotations,
!mbeditor will search editors, etc. Look at the link before for the full list.