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
Sones de Mariachi Negra", "The Vulture" and "The four real". Sones de Mariachi Sones de Mariachi is a piece for large orchestra composed by Mexican composer Blas Galindo and published in 1941. This piece is a rewrite of his earlier work "Mariachi Sones" for small orchestra, from 1940, elaborated on the occasion of the exhibition "20 Centuries of Mexican Art" which was held at the Museum of Modern Art in New York, for the Mexican music program that addressed the conductor and composer Carlos Chávez. The work, whose title evokes the juicy melodies that are played by folk instrumental ensembles called mariachi, is