 The "Misa"—a 16-minute Mass for either male or female soloists, chorus, and traditional instruments—is based on folk genres such as chacarera, carnavalito, and estilo pampeano, with Andean influences and instruments.Ramírez wrote the piece from 1963 to 1964, and it was recorded in 1965 by Philips Records, directed by Ramírez himself with Los Fronterizos as featured performers (Philips 820-39 LP, including "Navidad Nuestra", remastered in 1994 and released by Philips as CD 526 155).It was not publicly performed until 1967 in Düsseldorf, Germany, during a European tour that eventually brought Ariel Ramírez before Pope Paul VI.