The newsreel clip rich r saw, I suppose, is the one featuring Duke Davis Banjo Band, filmed in 1929. It's on Time Ain't Like Tey Used To Be: Early American Rural & Popular Music (Yazoo 521) [Video/DVD]. Note says: "Henry 'Duke' Davis' Banjo Band was a working band in the Boston area, playing on local radio and college functions. Duke demonstrates his version of the world's largest banjo and leads the boys in a hot but brief renditions of 'Ida.'"

~Masato