and at club matches. Música criolla attained national and international recognition with the advent of mass media during the 1930s, becoming a recognised symbol of Peru and its culture. The national team's most popular anthems are Peru Campeón, a polca criolla (Peruvian polka) glorifying Peru's qualification for the Mexico 1970 World Cup, and Contigo Perú, a vals criollo (Peruvian waltz) that newspaper El Comercio calls "the hymn of Peruvian national football teams". In 2018, a FIFA-sanctioned worldwide online poll honoured the "fervent and dedicated group" of Peruvian supporters at that year's World Cup tournament with the FIFA Fan Award. The Estadio Nacional disaster of 24 May 1964, involving Peruvian supporters, is cited as one of the worst tragedies in football history. During a qualifying match for the 1964 Olympics between Peru's under-20 team and its counterpart from Argentina, the Uruguayan referee Angel Payos disallowed a would-be Peruvian equaliser, alleging rough play. Spectators threw missiles from the stands while two fans invaded the pitch and attacked the referee. Police threw tear gas into the crowd, causing a stampede; trying to escape, fans were crushed against the stadium's locked gates. A total of 315 people died in the chaos, with more than 500 others injured. Rivalries The Peru national football team maintains prominent rivalries with its counterparts from neighbouring Chile and Ecuador. The Peruvians have a favourable record against Ecuador and a negative record against Chile. Peru faced both rivals in the 1939 South American Championship in Lima, which also marked the first time that Peru faced Ecuador in an official tournament; Peru won both games. Peru also defeated its rivals during qualifying for the Argentina 1978 World Cup, directly eliminating both teams. The Chile–Peru football rivalry is known in Spanish as the Clásico del Pacífico ("Pacific Derby"). CNN World Sport editor Greg Duke ranks it among the top ten football rivalries in the world. Peru first faced Chile in the 1935 South American Championship, defeating it 1–0. The football rivalry between Peru and Chile, partly a reflection of the geopolitical conflict between both neighboring states, is primarily a result of both football squads vying for recognition as the better team in South America's Pacific coast—as their football confederation is historically dominated by countries in South America's Atlantic coast. The two countries traditionally compete with each other over the rank of fourth-best national team in South America (after Argentina, Brazil, and Uruguay).