Watch Free Online HD Moviesjoy. Through interviews with Mrs. Elsa Ruth Cañas Ruiz (widow), Mr. Israel David Rivera Cañas (son) and teachers Sergio Cárdenas, Eliseo Martínez García and Juárez Lincoln Velázquez Moreno and the use of archival material, the life, work and legacy of Mr. Israel Rivera Pérez is narrated, who was the director of the "David" Choir of the National Presbyterian Church "San Pablo" of Oaxaca and founding director of the Choir of the City of Oaxaca.