Dedicated group-subject subcategories, such as Category:LGBT writers or Category:African-American musicians, should be created only where that combination is itself recognized as a distinct and unique cultural topic in its own right. If a substantial and encyclopedic head article (not just a list) cannot be written for such a category, then the category should not be created. (...) Generally, this means that the basic criterion for such a category is whether the topic has already been established as academically or culturally significant by external sources.