https://community.metabrainz.org/t/genre-tag-names-api-list/404075/ - in general, it might be useful to have a way to ask MB for the entire list of accepted genres with an API call.

Implementation

We'll add a new endpoint to the web service, /ws/2/genre/all.

• /ws/2/genre/all?fmt=json returns a paginated list of genres in JSON format.  limit/offset are supported for paging. This currently includes the genre name, gid, and disambiguation.
• /ws/2/genre/all?fmt=xml returns the same as above, but in XML format.
• /ws/2/genre/all?fmt=txt returns all genre names as a text list.  The names are separated by newlines.  limit/offset aren't supported here, since all names are returned.

All three formats return genres in alphabetical order.