AH. Geographically that gives me an explanation for the title, which I unfortunately would rather not put in writing. The short answer is the tune they where playing was in fact most likely Whup Jamboree, the title you were given, The Peacock, I would venture to guess came into usage in that part of the country about 30-35 years ago. A young fifer could very well be only familiar with that title and assume 18th century origin.