Red Bull Culture Clash is an indoor sound clash event hosted by Red Bull. Four crews compete in four or five rounds of genre-bending musical competition, with the winner decided by volume of crowd response. Founded in 2010, with a hiatus in 2015, the event is billed as "the world's biggest musical battle." In 2014, the event was attended by 20,000 people, with 30,000 anticipated in 2016.