There were several color sequences in this 1934 British production of "Radio Parade". They have a wonderful visual quality, and it's interesting that it should be used on a performance about race. Summary from NY Times:

Will Hay heads a cast of nearly 40 popular British variety artists in Radio Parade of 1935. The magnificent supercilious Mr. Hay is cast as William Garland, a radio-station manager whose operation is in big financial trouble. Our hero is baled out by Jimmie Clare (Clifford Mollison), head of the station's complaints department, who enlists the aid of his fellow employees to stage a big-time variety show. So grateful is Garland that he consents to the marriage of his daughter Joan (Helen Chandler) and the enterprising Mr. Clare. The film's guest stars may have not meant much to American audiences, but British filmgoers were delighted to see their favorites in action. Filmed in a primitive but eye-pleasing color process, Radio Parade of 1935 represents one of the first directorial efforts of Arthur B. Woods, whose promising career was tragically cut short in the early stage of WW II. In America, the film was released as Radio Follies. ~ Hal Erickson, All Movie Guide