Well, we know that Orson Welles signed Duke Ellington to a contract, at $1000 a week, to musically supervise It's All True, which eventually evolved into Welles' Brazillian project. Our spiritual leader, Lawrence French, provided us with a contemporary timeline, back in 2007:
"July, 1941 Duke Ellington’s Jump for Joy opens at Mayan Theatre, Los Angeles. Reports of Ellington in a deal with Orson Welles for The Story of Jazz project make news.July 29, 1941 It’s All True registered by Welles as title for omnibus film incorporating The Story of Jazz, My Friend Bonito, John Fante’s Love Story and Robert Flaherty’s The Captain’s Chair. September 4, 1941Welles joins Norman Foster in Mexico to scout locations for My Friend Bonito, which Foster is to direct from a Robert Flaherty story.September 14, 1941 The four Jangadeiros set off from Iracema Beach in Z-1 Colony of Fortaleza in the Brazilian state of Ceará en route to Rio to see President Vargas. September 25, 1941 First test shots done for the Tienta sequence of My Friend Bonito at La Punta hacienda in Aguascalienies, Mexico.October 15, 1941 Downbeat Magazine carries It’s All True as title of Duke Ellington’s project with Orson Welles . . . . "
The American Jazz portion of this cultural medley stumbled out of the Hollywood jungle as NEW ORLEANS, in 1947, with another musical figure of interest to Welles in 1941, Louis Armstrong, as a main character, and in charge of the Dixieland band.