Answer: I would contend that the right answer is prostitution.
Explanation: Just to elaborate a little bit on the answer, it can be added that those three artists—all French, since prostitution became a subject of great interest in France and other parts of Europe in the nineteenth-century—explored the traditional theme of prostitution, although with a different approach: a very contemporary one, which showed the crude reality of it openly and without reservations. Manet's <em>Olympia </em>(1865) caused a great scandal when he exhibited it at the Paris Salon, in spite of its references to classical models, such as Titian's <em>Venus of Urbino</em>. He portrayed a prostitute that looked at the viewer without any shyness. In addition, both Degas and Toulouse-Lautrec painted brothels. Examples of this are <em>The Madam's Name Day</em> (1876), by Degas, and <em>Salon de la Rue des Moulins</em> (1894), by Toulouse-Lautrec.
During the Depression years, Copland traveled extensively to Europe, Africa, and Mexico. He formed an important friendship with Mexican composer Carlos Chávez and would return often to Mexico for working vacations conducting engagements.