Patrick,For information like this, meaning anything from old musicals and movies, I'd highly recommend you e-mail Richard Ouzunian at CBC (Canada's national English-language broadcaster). He hosts a weekly show called "Say It With Music" which is programmed from musicals. Even if CBC doesn't have it in their archives, Mr. O or someone in the CBC record archives will know if it's still available in some format.
My computer needs features I don't have to visit their 'infoculture' page and give you the URL, but search on both infoculture and cbc.ca to get a link. From the left-hand list, click Entertainment. The entertainment home page has a pulldown a-z list of programs to jump you to each subsite.
Of course if you're Canadian, you probably already know all those instructions. If a recording is available in Canada, I would try Sam the Record Man first - huge selection in diverse and eclectic genres as well as the trendy money-makers.
Best of luck! Worst case scenario, I suppose, is that you'll have to pay someone to score it and convince a men's choir/chorus to record it. **BG**
Maybe BBC, ABC and PBS have similar resources, I don't know.