My friend and fellow JHUI alum Bryan LaPlante reminded me today of this 1975 documentary from the National Film Board of Canada, featuring Godfather of the Canadian 'Ukulele Movement, J. Chalmers Doane and 1,000 Halifax school children playing Mac Davis's I Believe in Music. Bonus: "rather critical lack of bathroom facilities." Stream "Ready When You Are" at this link.
And there's more: Melanie Doane's tribute to Mac Davis, featuring the kids from the 1970s and her students from the Doane Uschool. Link
Of course, while you're at it, you really should watch Melanie's Ukulele U on the CBC.