Mariachi bands have been a mainstay in Mexican culture for hundreds of years. It has become emblematic of Mexican music by being some of the first music on Mexican radio and film, and by creating some of the regional song forms of the country. Typically a Mariachi band uses violins, trumpets, and guitars (including a low-pitched guitar, a guitarron, and a high-pitched one, a vihuela).
The mariachi style actually has many stylized song forms, analogous to Baroque and Renaissance dance forms. 2/4 song forms include Cancion ranchera, Corrido, Polka, and Pasodoble, and 3/4 forms include Valses mexicanos, Son Jaliscience, and Huapango.