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 of Mexican society in the early 20th century. This would change in the latter half of the 20th century, but the music remains strongly associated with tequila. Mariachi music and musician became more professional with more formal training starting in the late 1940s and early 1950s, principally due to the success of a major Mariachi by the name of Mariachi Vargas. Their appearance in many films, backing many singing stars and their hiring of a formal musician prompted other mariachis to do the same. The group also expanded adding trumpets, violins and even a classical guitar to become a kind