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 to pursue his dream of becoming a mariachi like his father. From the confines of his heavily guarded villa on the outskirts of town, Moco sends a large group of hitmen to kill Azul. They are told to look for a man who is wearing black and carrying a guitar case, but because the Mariachi also matches this description, the hitmen mistake him for Azul and begin to pursue him. Only Moco, however, knows Azul's actual face. The Mariachi is then forced to kill four of the attackers in self-defense after being chased through the streets. As the Mariachi seeks