"1963-01-06T14:30:00"^^ . "Benefit Concert for La Prensa Welfare Fund by Marta Pérez, Mezzo-Soprano, and Graciela Rivera, Soprano" . . . . . . . . . . "La Prensa is identified in the printed concert program as the first Spanish-language newspaper in the United States." . "duo recital" . . . . . . . . . . . . . . . "benefit performance" .