Silent films continued to be made throughout the 1920s, in parallel with the early years of sound films during the final years of the Weimar Republic. Silent films had certain advantages for filmmakers, such as the ability to hire an international cast, since spoken accents were irrelevant. Thus, American and British actors were easily able to collaborate with German directors and cast-members on films made in Germany (for example, the collaborations of Georg Pabst and Louise Brooks). When sound films started being produced in Germany, some filmmakers experimented with versions in more than one language, filmed simultaneously.