Mariachi songs were longer than the standard three-and-a-half minutes of the then-standard 78 rpm record, forcing the shortening of tunes. Around the same time, the popularity of jazz and Cuban music introduced the trumpet into mariachi, pushing the violins into second place and in some cases, replacing the harp. The most prized of the mariachis remained those from the state of Jalisco, particularly the areas of Cocula and Tecalitlán. They represented Mexico to the people during the Independence Day celebrations in Mexico City in 1933 as well as during Lázaro Cárdenas' election campaign in 1936. The charro tradition was strong in
Mariachi de Tecalitlán from his father in 1958 and soon after hired a trained musician, Rubín Fuentes, as musical director. Fuentes along with Vargas were instrumental in the standardization of much of mariachi music, arranging traditional songs and writing new ones that would be performed by many of the legendary performers of the mid-20th century, such as Pedro Infante, Miguel Aceves Mejía, Lola Beltrán and José Alfredo Jiménez. Mariachi Vargas still remains, tracing its history in terms of generations, starting in the 1890s, with these generations maintaining the group’s authenticity as a Mariachi while the music has evolved. The last Vargas