Folksonomy Tagging
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You can add folksonomy tags to any entity in MusicBrainz except URLs. They are comma-separated, so they may consist of several words. You can use any Unicode character (except for commas) as part of your tags, but any letters will be lowercased automatically.
There's no limit to what you can use tags for. For example:
Genres
Nationalities
Professions
Combinations of the above
Trivia
Pleas for help
Personal opinions