Mariachi was heavily involved in cultural promotion as a way to create a unified Mexican identity after the end of the Mexican Revolution. One of these efforts was the promotion of mariachi as an international symbol of Mexican identity, first with radio and sound recordings and later with films. Mexico built a nationwide radio broadcasting network in the 1920s such as XEB and XEW, which began broadcasting mariachi music as a media production, rather than as a music for social events. This music was already being modified in part due to the advent of sound recording. For example, most son jaliscense
Mariachi rajes!" and "¡Así se quiere en Jalisco!" The main characters used his ability to sing mariachi as a way to show strength, virility, and aesthetic beauty. Its use in film also made the music popular and a symbol of ethnic pride for Mexican Americans in the United States. Its use in film also promoted a negative perception of mariachi music. The films associated the charros and mariachi music with machismo, womanizing and drinking, especially of tequila. The reason that the movies did this was that mariachi music was associated with bars and the lower classes in a number of segments