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 schools. In areas with large Mexican-American populations, mariachis are being hired for events outside this ethnic group as well. Outside of schools, the most important venue for the music in the United States is mariachi festivals with the longest running festivals in Tucson and Fresno. The Tucson International Mariachi Conference began in 1982. It originally was held in the downtown but in 2012 moved to the Casino Del Sol. It showcases over 500 elementary, middle, and high schools and college mariachi players. The Las Vegas International Mariachi Festival, established in 1991, is televised on Telemundo and PBS and has headlined