This song had been a jazz standard since the music was in its infancy, so by the time this short was filmed in 1933, any self-respecting jazz musician could really cook on it. I believe that this was filmed at a concert in Copenhagen, Denmark. He exhibits remarkable patience in the construction of his solo, resisting the easy temptation to let loose with a interminable volley of notes.

Here’s ‘I Cover the Waterfront’ from the same film. Besides being the greatest coronetist and trumpeter in jazz, Armstrong was arguably the finest jazz singer of his era.