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 song due to voice qualities. Mariachi vocalization shows influences from a number of styles such as bolero (a romantic style), huapango (using falsetto), son jalisciense (an aggressive style) and more. Voices must be strong to be heard over amplified instruments. Vocal style emphasizes operatic qualities and instrumental performance demonstrates a level of virtuosity that reflects advanced musical training. Historically, mariachi groups have been made up of men but there is growing acceptance of female mariachis. As mariachi groups are expected to play requests, they may need to know hundreds of different songs. Most songs are about machismo, love, betrayal, death,