In 1964, Argentina, like much of the rest of the world, was shaken by The Beatles phenomenon. Historians describe a parallel pattern of development with the United States in certain aspects of culture. Both countries were the destination for millions of Europeans, and their musical heritage were heavily influenced by Pan-European folk and traditional marches. These similar musical infusions yielded related results in both: a grass-roots rural guitar-based musical tradition, becoming Bluegrass and Country in the US, in Argentina Folklore and Pampas music. Country music is an important pillar of Rock & Roll. In Argentina folklore (at that time Nueva canción was sweeping Argentina), was increasingly crossing over to popular musical trends by the late 1950s. Late 60s beat music By 1965, rock music was developing rapidly in Argentina. On television, several shows such as Ritmo y Juventud and El Club del Clan, with singers like Palito Ortega, Violeta Rivas, Chico Navarro, and Lalo Fransen, featured a poppy version of rock, which owed equal amounts to Merseybeat and to Argentine and Italian romantic pop. Nevertheless, it was in the underground where the most influential figures of early Argentine rock would emerge. In former Jazz bars like "La Cueva" or "La Perla del Once", figures like Moris, Pajarito Zaguri, Javier Martinez (drummer and lead singer in the Argentine blues band Manal) Miguel Abuelo, and Tanguito would gather in the mid-1960s Argentina to exchange ideas. Los Beatnicks, of which Moris and Martinez where members, began the transition that would slowly take Argentine rock from imitation to a more creative state (while still following UK trends mainly). Forming in quiet beaches of Villa Gesell, they recorded the first Spanish language single in 1966 called "Rebelde". The definitive breakthrough of Spanish-language, original material rock would be up to the band Los Gatos. After playing in "La Cueva" for a few months, the band released two singles in 1967. One of them, "La Balsa", co-written by Tanguito and Litto Nebbia, sold 200,000 copies. This contributed to the widespread popularity of the genre because it was in Spanish and it was an original composition. The following year saw the first publication of Pinap, a rock magazine, and the founding of the first Argentine rock label, Mandioca. In 1969, four major concerts of so-called "música beat" ("beat music") were held: the June Sunday concerts, Festival Nacional de Música Beat, Festival Pinap and Festival de Música Joven. In