https://musicbrainz.org/doc/Style/Artist#Performance_names_and_legal_names

since STYLE-2328 has gone through, this page needs updating with the new relationship name. perhaps something like:

If they're a person, either a separate legal name artist should be added, and linked to all performance names with the is person ("performs as") relationship, or if their legal name is not known, one performance name should be linked to all other performance names. In this case, do not add legal name aliases to the performance names.