Mariachi is a form of folk music from Mexico. Mariachi began as a regional folk style called “Son Jaliscience” in the center west of Mexico originally played only with string instruments and musicians dressed in the white pants and shirts of peasant farmers. From the 19th to 20th century, migrations from rural areas into cities such as Guadalajara and Mexico City, along with the Mexican government's cultural promotion gradually re-labeled it as Son style, with its alternative name of “mariachi” becoming used for the “urban” form. Modifications of the music include influences from other music such as polkas and waltzes, the addition of trumpets and the use of charro outfits by mariachi musicians. The musical style began to take on national prominence in the first half of the 20th century, with its promotion at presidential inaugurations and on the radio in the 1920s.