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 this enterprise, and of Los Camperos in general have inspired many mariachi groups in the United States. In the late 1980s, pop star Linda Ronstadt recorded "Canciones de Mi Padre" and "Más Canciones" with Mariachi Vargas de Tecalitlán and others, which helped promote its popularity among Mexican Americans and to non-Mexican Americans. Some U.S. public schools offer mariachi as part of classes. The first student Mariachi group was begun in 1961 at the University of California, Los Angeles. This prompted the creation of other student organizations in other parts of California and then in Texas, where the first mariachi festival