[1] In addition to the cultural characteristics, it contained political and social elements of protest in the midst of the Franco dictatorship.
Its development coincided with similar movements in other areas of Spain, such as the case of Els Setze Jutges within the Nova Cançó in Catalonia or the Manifesto Canción del Sur, in Andalusia.
The name of the movement was proposed by the sculptor Jorge Oteiza in 1965 based on a Basque folk tale, San Martinen estutatusuna (Saint Martin's plight), collected by Resurrección Mª de Azkue, which concluded with the phrase "Ez dok amairu" (literal translation "there is no 13"), which means that "there is no curse", that the curse of thirteen had been broken.
[2] In 1970 the group presented the show Baga biga higa sentikaria, a proposal that would represent a significant change, both aesthetically and musically, in the new Basque song.
In 1971 Benito Lertxundi released an album with the title "Ez dok amairu" which included the well-known songs "Zenbat Gera" and "Urak dakarrena".