Mariachi giving them modified shapes and tunings. In addition to instruments, the Spanish introduced the concept of musical groups—which, in the colonial period, generally consisted of two violins, a harp, and various guitars. This grouping gave rise to a number of folk musical styles in Mexico. One of these folk musical styles was the "son". This music featured string instruments. "Son" music divided into various regional varieties—the variety popular in the Jalisco area was called "son jalisciense", whose best known song, also referred to as "the mariachi national anthem," is “La Negra.” Modern mariachi music developed from this "son" style, with
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