Mariachi tradicional with other ensembles of the region, like "conjunto calentano", "conjunto de arpa grande", "conjunto de jaraberos" and "conjunto de son de tarima" of the so-called Mexican son. Mariachi tradicional Traditional mariachi is a string ensemble from western México. Unlike the popular mariachi, this ensemble generally does not include trumpets. It consists of violins, guitarra de golpe, vihuelas, harp and guitarrón or double bass, and in some zones a bass drum is used. This mariachi developed from the beginning of 19th century and from this ensemble derived the mariachi with trumpets. Its repertoire generally covered "sones abajeños", "sones arribeños", "sones costeños"
Mariachi problems recruiting mariachi instructors as many of these do not have required teaching credentials. For this reason, schools often hire trained musicians from outside the mariachi tradition. Many traditional mariachis are concerned that standardization will lead to fossilization and restrict improvisation. Other innovations in the United States have been the incorporation of styles of artists such as Elvis Presley, Freddy Fender and Glenn Miller, as well as the heavy-metal Mariachi band Metalachi. Another is the encouragement of female mariachis including all-female Mariachi groups such as Mariachi Mujer 2000 and Mariachi Divas de Cindy Shea. Mariachi Mujer has performed with Mexican