I'm not clear on when to use the origins tag and/or the history-of tag. It seems to me that about 70% of the questions tagged history-of are asking about origins and would fall under the definition of the origins tag. On the other hand, many of the questions tagged origins are about the history of the genre. (According to the definition of the origins tag I'd expect all of the origins questions to be historical.)
Please explain (preferably with an example for each case) what questions should be tagged history-of rather than origins, what questions should be tagged origins rather than history-of, and what questions (if any) should get both of those tags.