Peru has developed its own interpretation of the European waltz, specifically amongst the criollos who are a mix of Spanish, indigenous, and Afro-Peruvian ethnicities . In the first half of the twentieth century, the genre became a symbol of national pride especially of the urban working classes. While maintaining the triple meter of the European waltz, the Peruvian waltz involves the interplay of two acoustic guitars (one playing higher strings and one playing lower strings) and occasionally the cajón. The genre has inspired musicians outside the Spanish-speaking world such as Edith Piaf whose hit “La Foule” is the French language version of the Peruvian waltz titled “Que nadie sepa mi sufrir.”