Since the 1930s, the mariachi has been widely considered the quintessential Mexican folk-derived musical ensemble, and has become an institution symbolic of Mexican music and culture. Mariachi groups are currently found in many countries around the world.

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.

Today, mariachi bands usually feature at least four musicians. Often, they include as many as a dozen or more! Traditional mariachi instruments are the violin, guitar, guitarrón, and vihuela (a small five-string guitar with a round back).

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.