New York is the most populous city in the United States and the centre of the New York Metropolitan Area - one of the most populous urban agglomerations in the world. It has also been described as the cultural capital of the world. Numerous major American cultural movements began in the city, such as the Harlem Renaissance. The city was a centre of jazz in the 1940s, abstract expressionism in the 1950s, and the birthplace of hip-hop in the 1970s. The city's punk and hard-core scenes were influential in the 1970s and 1980s, and the city has long had a flourishing scene for Jewish American literature. New York City is home to hundreds of cultural institutions and historic sites, many of which are internationally known.