Tim J:

I remember the 1950s movie, "On the Beach" [film version of Neville Shute's book) had a brief snatch of Waltzing Matilda sung to a slightly different tune (it sounded folkier than the popular renditions one normally hears). The movie featured Gregory Peck and Fred Astaire (in a rare non dancing role) ... Oh you can carry on with the music discussion now...

Cheers, Brian