"La Onda" was a literary consequence of the introduction of Anglophone Rock Music to the culturally conservative, socially rigid Mexican society of the 1960s. In the event, the cultural (generational) non-conformity inherent to the music of bands and singers such as The Doors, The Rolling Stones, The Beatles, Jimi Hendrix, and Janis Joplin, gave form (thought and action) to the cultural, societal, and generational discontents of Mexican young people — from every Mexican social class — to openly rebel against limiting tradition. Consequent to that great foreign-culture influence, the Mexican Middle class began to intellectually, then culturally, associate with the Hippie social movements of the U.S. and Europe. Mexican artists subsequently developed a national counter culture, based upon an amalgamation of foreign and domestic rock music, literature, language, and fashion, an example of which was the rock concert "Festival Rock y Ruedas de Avándaro" (11 September 1971); a time that Prof. Eric Zolov said "was a new transnational and trans-cultural era".