Gone was the total reliance of the musicians on their ears to pick up new songs, and techniques. With this giant step toward professionalism coinciding with the development of recordings, radio and film, the Mariachi Vargas was able to become the ideal that all other groups would emulate. With the addition of two trumpets, a classical guitar and more violins, by the 1950's the Mariachi ensemble had become a complete, adaptable orchestra, with the ability to retain its traditional base while it was assimilating new musical ideas and styles. The importance of Mariachi Vargas cannot be overestimated. Its arrangements have become the definitive statements of what the Mariachi should be.
Mariachis often help celebrate the great moments in the lives of the Mexican people.
In a society where the young members of opposite sexes were kept apart, the serenata was a means of communication by which a young man could send a message of love to the woman of his heart. The Mariachi is usually positioned strategically on the street beneath the window of the festejada , but the sound of its music echoes through the whole neighborhood. Mariachis are also commonly hired for baptisms, weddings, patriotic holidays, and even funerals. It is not unusual for the deceased to leave a list of favorite songs to be sung beside the grave at burial. The first Mariachi Mass was the concept of a Canadian priest, Father Juan Marco Leclerc, and has been celebrated in Cuernavaca since 1966.