Assuming j is required, and marshall is required, and bevil is required, the following result was found.
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Scale in Southern Appalachian Folksong: A Reexamination
Ellis kindly communicated his conclusion to me in 1972 while the article on Robert ap Huw was in preparation. 24J. Marshall Bevil, "Centonization and Concordance in the American Southern Uplands Folksong Melody: A Study of the Musical Generative and...