Their first nationwide hit was ' El tierno se fue' ('The nice guy is gone') in 2011, a ranchera written by Lalo Ayala which contains many innuendos and describes a sexual act in detail. The name of the band comes from the comparison 'with an element that will symbolize the strength and impact that the project has on the lives of the members, as well as those who like the Regional Mexican genre.'Ĭalibre 50 first achieved notoriety for their controversial songs, among them corridos. They chose the name by which they are known today: Calibre 50. However, the original Colmillo Norteño sued them over the name, and after a legal dispute Muñoz' band was forced to change their name later in 2010. The name of this new band was 'Puro Colmillo Norteño', and they recorded their first album, ' Renovar o Morir', under that name, as well as their first single (' El infiernito'). Nevertheless, conflicts with the other members of the band led Muñoz to quit Colmillo Norteño in early 2010, and he founded his own band later that year, recruiting Armando Ramos as guitarist and backing vocalist, Martín López as sousaphonist, and Augusto Guido as drummer. With Muñoz, the group scored the hit songs ' Sueño guajiro' and ' Hotel El Cid' in 2009, among others.

Before establishing Calibre 50, Edén Muñoz had been the accordionist and vocalist in the Norteño-banda group, Colmillo Norteño.

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