of them became teen idols. In the early years of the decade, groups like Los Rebeldes del Rock (whose recording "Hiedra venenosa" is considered to have been the first rock and roll recording to be broadcast in Mexican radio, back in 1959), Los Hooligans, Los Locos del Ritmo, among many others, became very famous recording Spanish-language covers of American and British rock standards, as well as some original songs. One group in particular, Los Teen Tops was very popular in Mexico and in many other countries of the Hispanic world, specifically in Argentina and Spain; their recordings "La plaga" and "Popotitos" are considered some of the most representative of the era. Festival Rock y Ruedas de Avándaro, La Onda Many Mexican rock stars became involved in the counterculture movement. One of the most notorious bands from this decade was La Revolución de Emiliano Zapata, from Guadalajara, Mexico. After winning a local contest, they signed a contract with Polydor Records, and their single "Nasty Sex" was a #1 hit in Mexico in 1971, the only rock song from a Mexican band to achieve such a feat in that decade. However, after many members left the band and the Mexican government severely restricted the recording, publishing, and airplay of rock music in the country, the band (like many others at the time) changed its format and became a romantic ballad group. The two-day Festival Rock y Ruedas de Avándaro, held in 1971, was organized in the hamlet of Tenantongo near the city of Toluca, a town neighboring Mexico City, and became known as "The Mexican Woodstock". At that rock festival, nudity, free love, experimental drug use, profanity, the peace sign inserted in the Mexican flag and the presence of the American flag so scandalized the conservative Mexican society that the government imposed cultural curbs to La Onda, and especially to rock music. The media called the move El Avandarazo. The festival, intended to emulate Woodstock and Altamont, expected to attract a maximum of 25,000 concertgoers but about 300,000 showed up. The government helped some stranded attendees at the end of the festival by sending 300 buses. During President Luis Echeverría's administration, the Mexican government tried to win back the country's legitimacy through populist, leftist-oriented programmes. Most things that could possibly be connected to the counterculture or to student protests were sidelined on public airwaves by the powers that be, who feared a