I Hear You Knocking But You Can't Come In by The Harry Brent Orchestra (Improved A/V) - A Soundie from 1946. A "Soundie" is an American musical films, about 3 minutes long, produced between 1940 and 1947, each displaying a song, dance, and/or band or orchestral number. Produced professionally on 35mm black-and-white film, like theatrical motion pictures, they were printed in the more portable and economical 16mm gauge.- Info source: Wikipedia