Real film of Robert Johnson, Hayes McMullan, Robert Petway, Mississippi Fred McDowell

This film shows Robert Johnson singing and playing banjo  with Hayes McMullan, Mississippi Fred McDowell, Robert Petway and someone else unidentified The identifications were made by the publisher of the blues music news service  kingbiscuitblues.com Johnson sings McDowell's verse then stops and covers his mouth laughing and a voice behind the camera says "finish the song" Petway gives McDowell a consolling look over his shoulder  The laughter scene at the end probably refers to Johnson guzzling a bottle of whiskey nearby