In 1988, during a radio interview with the journalist and radio host Max Jones, Hall explained how she came up with the counter-melody in "Creole Love Call". An excerpt from the interview can be heard in the British Library article (published 17 December 2020) on the British Library blog titled Oral History of Jazz in Britain.
^USA song chart entry for "Creole Love Call" (1928). The song is #29 in the list of Ellington chart entries with information that it entered the Billboard charts at #19 in 1928.
References
A. H. Lawrence, Duke Ellington and His World (London: Routledge, 2001), p. 112. ISBN978-0-415-93012-3.