When Dr. Kern is helping Mrs. Coke-Norris go through her late husband's books, the music playing in the background is Rachmaninoff's second piano concerto, famous as the theme music of the 1945 film.
Going through her late husband's books, Mrs. Coke-Morris finds a translation of the "Agamemnon", which she says was a gift. The 1951 film concerns just such a translation of this work being given as a gift to the central character.