Paris for 31 percent of the GDP of France. According to the Economist Intelligence Unit Worldwide Cost of Living Survey in 2018, Paris was the second-most expensive city in the world, behind Singapore and ahead of Zurich, Hong Kong, Oslo and Geneva. The city is a major rail, highway, and air-transport hub served by two international airports: Paris-Charles de Gaulle (the second busiest airport in Europe after London Heathrow Airport with 69.5 million passengers in 2017) and Paris-Orly. Opened in 1900, the city's subway system, the Paris Métro, serves 5.23 million passengers daily, and is the second busiest metro system in
Music in Paris major venue for popular music. Many of the churches in Paris have magnificent historic organs, and often host concerts. The city is also known for its music halls and clubs. The Paris Opera, officially called the "Opéra National de Paris" founded in 1669, is the oldest and most famous opera company of France. It mainly produces operas at its modern 2700-seat theatre Opéra Bastille which opened in 1989, and ballets and some classical operas at the older 1970-seat Palais Garnier which opened in 1875. Small scale and contemporary works are also staged in the 500-seat Amphitheatre under the Opéra Bastille.