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
El Mariachi refuge in a bar owned by a beautiful woman named Dominó, he quickly falls in love with her. Unfortunately, Moco is not only financing the bar, but also has his own romantic interest in Dominó. When Azul visits the bar for a beer and information about Moco, he accidentally leaves with the Mariachi's guitar case. Moco's thugs capture Azul on the street but let him go when they learn that the case he is carrying contains only a guitar. A short time later, the Mariachi is captured and taken to Moco, who identifies him as the wrong man and sets