As MusicBrainz will gain support for genres Picard should also support this. Some ideas about this:

• Genres should probably be optional, since not all people want genres and there are multiple plugins getting genre information from different sources
• We should perhaps keep the current folksonomy tags feature, at least for the first releases with genre support
• We could rename the options page Metadata > Folksonomy Tags to Metadata > Genre and combine both options for using proper genre and folksonomy tags into one page

Alternatively we could also just drop folksonomy tags and replace their implementation with the genre feature.

Example JSON response:

https://beta.musicbrainz.org/ws/2/release-group/3bd76d40-7f0e-36b7-9348-91a33afee20e?fmt=json&inc=genres