Simón Díaz). The Zulian gaita is also a popular style, generally performed during Christmas. The national dance is the joropo. Teresa Carreño was a 19th-century piano virtuoso. The Simon Bolivar Youth Orchestra has performed in many European concert halls, including at the 2007 Proms Festivals The celebration of Corpus Christi includes dancing in the streets in masks and uniforms of Dancing Devils. The tradition dates back to Spanish colonial times. Sports Baseball is Venezuela's most popular sport. There is a Venezuela national football team. The World Values Survey has shown Venezuelans to be among the happiest people in the world, with 55% of those questioned saying they were "very happy" in 2007. Sources Nick Wood