Alma y Vida. The behemothic success of the Acusticazo was a turning point in which Argentine began to be listened massively. That same year, Tanguito was killed hit by a train. Conspiracies about his death abound, including that he committed suicide and even that he was thrown onto the tracks by police. As he was a heavy drug user, others contend he simply might have tripped. The 1993 motion picture Tango Feroz ("Wild Tango") tells the life of Tanguito. As the 1970s progressed, acoustic rock continued as the most popular style in the country. Sui Generis farewell concerts Sui Generis began shifting from their classic acoustic rock to a more electric and visceral sound. Also, stirring in the Argentine underground were new bands with a radically different sound from either acoustic or heavy rock: influenced by some of acoustic rock's more experimental works (such as Arco Iris and their Agitor Lucens V with its world music influences), by Tango music and also by British progressive rock. This would be the blueprint of Argentine progressive rock that would bloom into the apex of the movement in 1975. As that year began few could foresee what a watershed it would become not just in Argentine rock history, but the country's too. Charly García and Nito Mestre decided it was time to leave Sui Generis. Their two final concerts took place at the Luna Park Arena, on September 5 of 1975, in front of 30,000 people. Historians have come to see the Sui Generis farewell concerts as the end of the 'Classic' Argentine rock era. Acoustic rock was passing into history: bands dissolved, changed their sound, and those that remained lost popularity and became only cult followings. Argentine progressive rock was on the rise, and so was the political repression to freedoms of expression. Also, several bands would leave the country for greener pastures in Europe, mostly Spain, among them Moris and Aquelarre. The Classic era of Argentine rock music was completely over by 1976. As this year began, Argentine rock became far more sophisticated and conceptual. A few acoustic bands would continue having moderate success, including Pastoral, and Nito Mestre y Los Desconocidos de Siempre. But it was the beginning of the period of symphonic and progressive rock dominance. 1975−1983: The intermediate period Progressive rock As early as 1973, the band Contraluz combined rock with progressive and folk tinges. They would be