This is not really a movie : it looks like future TV show business hour! No plot in this film : just a succession of musical and comedy numbers. Knowing that, King of Jazz is surely an important document of the show business in the USA in 1930. It shows us dancing, singing, big orchestral, comedy, vaudeville, etc. Some of the numbers are very good, some are awful. And the whole movie is in weird primitive Technicolor bichrome! A must to see!