The music originated in the center-west of Mexico. Most claims for its origin lie in the state of Jalisco but neighboring states of Colima, Nayarit, and Michoacán have also claimed it. However, by the late 19th century, the music was firmly centered in Jalisco.

The mariachi orchestra emerged in the late 1700s or early 1800s in west-central Mexico. The word mariachi may have come from the now-extinct language of the Coca Indians, but both the word's etymology and the early history of the form and its followers are unknown.

A mariachi band consists of a minimum of 3 up to 9+ musicians. An authentic mariachi band will have hundreds of songs in their repertoire, and as well as performing traditional mariachi music, can include other Mexican and Latin style rhythms.

ma·​ri·​a·​chi ˌmär-ē-ˈä-chē ˌmer- 1. : a small, strolling, Mexican band consisting usually of trumpeters, guitarists, and violinists. also : a musician belonging to such a band.