During the later part of the 16th century Amsterdam's Rederijkerskamer (Chamber of Rhetoric) organized contests between different Chambers in the reading of poetry and drama. In 1638, Amsterdam opened its first theatre. Ballet performances were given in this theatre as early as 1642. In the 18th century, French theatre became popular. While Amsterdam was under the influence of German music in the 19th century there were few national opera productions; the Hollandse Opera of Amsterdam was built in 1888 for the specific purpose of promoting Dutch opera. In the 19th century, popular culture was centred around the Nes area in Amsterdam (mainly vaudeville and music-hall). The metronome, one of the most important advances in European classical music, was invented here in 1812 by Dietrich Nikolaus Winkel. At the end of this century, the Rijksmuseum and Stedelijk Museum were built. In 1888, the Concertgebouworkest was established. With the 20th century came cinema, radio and television. Though most studios are located in Hilversum and Aalsmeer, Amsterdam's influence on programming is very strong. Many people who work in the television industry live in Amsterdam. Also, the headquarters of SBS 6 is located in Amsterdam.