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 of Mexican society in the early 20th century. This would change in the latter half of the 20th century, but the music remains strongly associated with tequila. Mariachi music and musician became more professional with more formal training starting in the late 1940s and early 1950s, principally due to the success of a major Mariachi by the name of Mariachi Vargas. Their appearance in many films, backing many singing stars and their hiring of a formal musician prompted other mariachis to do the same. The group also expanded adding trumpets, violins and even a classical guitar to become a kind