Osvaldo Nicolás Ferraro Gutiérrez better known as Waldo de los Ríos was an Argentine composer, conductor and arranger.
De los Ríos was born in Buenos Aires into a musical family; his father was a musician and his mother a well known folk singer; he studied composition and arranging at the National Conservatory of Music under Alberto Ginastera, Teodoro Fuchs, and Lita Spena. From Wikipedia
