e was born in the Buenos Aires locality of Villa Adelina. He is the one before the last of the five siblings of Carmen Rodríguez and Domingo Santieusanio.

He was, due to his style and voice color, the ideal singer to replace Jorge Valdez in the orchestra led by Juan D'Arienzo. He had volume, good diction and very good intonation.

When he was only 15 his vocation for singing began to be evidenced in familiar reunions and circles of friends. Once he appeared at a talent contest in the locality of Munro, province of Buenos Aires, and turned out the winner. That same year, 1948, he made his debut with the quartet fronted by the bandoneon player Beliera. This group played danceable music in clubs of Don Torcuato, Villa de Mayo, Los Polvorines and neighboring towns.

Neighbor of the bandoneonist Orlando Vitullo, leader of a quartet of the vicinity, he attended the rehearsals of the group and, in that way, he polished his musical apprenticeship and shaped his style.

In 1951 he won an important talent contest in the La Armonía tearoom on Corrientes Street. Because of it he was hired as singer for two months and was backed by the guitarists Olmos, Medina and Francese.

After military service he interrupted his activity for some time and resumed it in 1956 by joining the Romero-Spinelli Orchestra. Then he chose the sobriquet Osvaldo De Santis. With that aggregation he appeared for two years in many dancehalls: El Palacio Güemes, Salón Colegiales, Salón Urquiza and in the carnival balls. He had a good songbook, his tour de force tangos were: “Remembranzas” and “Lágrimas de sangre”, among others.

In 1958 Leopoldo Federico suggested him to join his orchestra to replace Hugo Marcel that had quit. He made his debut at a club of the locality of Matheu and, soon later, appeared in the carnival balls of the Club Atlético Boulogne. Also they performed on Radio Belgrano and TV Channel 7, at the Richmond tearoom, and on tours of the interior of the country.

Thereafter he switched to the Alberto Mancione’s orchestra, appearing on Radio El Mundo, TV Channel 11, El Palacio Güemes and in many clubs.

In 1960 he joined the Florindo Sassone Orchestra. He replaced the singer Alberto Fontán Luna. They appeared on Radio El Mundo and on television. As well they performed in Patio de Tango (formerly La Armonía) and in Marabú. He also toured Uruguay. On June 21, 1960 he recorded the tango “Esclavo de tu piel” composed by Lucio Demare with lyrics by Alberto Martinez. That was his first recording. Later he cut 5 recordings more with Sassone.

In 1963 he was summoned by Aníbal Troilo to join his orchestra. The latter had heard him sing with Sassone at the Primer Festival de Tango de La Falda (Córdoba) and needed him to replace Roberto Rufino. The proposal was made through Osvaldo Berlingieri who, together with Ernesto Baffa, played in a cabaret near Radio El Mundo, the radio station where Osvaldo appeared.

But that did not happen because of a talk he had with Francisco Mele, Sassone’s collaborator, who advised him to continue with the leader a little longer because he foresaw other proposals. Then one day in 1965 Juan D'Arienzo invited him for an audition. The vacancy left by Jorge Valdez had to be filled.

The leader himself, Juan Polito, Carlos Lázzari and the agent Emilio Curi were responsible for the choice in the audition that was made on Radio El Mundo. It was a list of three candidates that also included Juan Carlos Godoy and Alberto Cuello. Osvaldo was chosen and D'Arienzo changed his sobriquet and, since then, he became Osvaldo Ramos.

They appeared on the Splendid and El Mundo radio stations. Also in Sábados continuados, emceed by Nicolás Mancera on TV Channel 13 and in Yo te canto Buenos Aires with Julio Jorge Nelson (Channel 11).

In August 1965 he cut “Sentimiento gaucho” and, in 1967, appeared with the orchestra in the movie “Una ventana al éxito” singing “El tren de las ocho”. They toured Uruguay, the interior of the country and, in 1970 they appeared in Michelangelo and at the Chantecler. With El Rey del Compás he recorded around 70 numbers.

In 1971 D'Arienzo with his three singers: Armando Laborde, Alberto Echagüe and Osvaldo Ramos appeared at the Teatro Odeón, in a tango revue, sharing the billboard with Tito Lusiardo, Roberto Goyeneche and Alba Solís.

Due to the lack of jobs for tango players, the leader allowed his musicians to try other possibilities. So in 1973 Los Solistas de D'Arienzo were born. That same year they recorded for Music Hall but under the name Los Solistas because of contract engagements by D'Arienzo with the Victor company. Apart from that, in 1975, Ramos recorded two numbers with the outfit led by Dante Smurra.

He was vocalist of the orchestra until the demise of the leader. He recorded 58 numbers alone and 9 in duo with Armando Laborde. Among his best renderings are: “Bailate un tango Ricardo” and “El bar de Rosendo” written by Ángel D'Agostino and Enrique Cadícamo.

With Los Solistas de D'Arienzo and along with Alberto Echagüe he appeared at the program Grandes valores del tango, on Channel 9, made tours of the interior of the country and in 1978, tours of Colombia, Peru, Brazil and Uruguay.

In 1985 he returned to the recording studios, on this occasion, with the quartet led by Mario De Carlo and with the Omar Valente’s orchestra, and between 1993 and 1997, with Los Dandys del Compás.

He is author of the tangos “Bailarín milonguero” and “Corazón de poeta” with Antonio Spinelli; “Mi vida yo la reviento” with Ernesto Franco; “Plegaria para un hijo” and “Nuestro amor es pecado” with Carlos Lázzari; “Hoy Momo hace reír”, “Ha partido mamá” and “Un papel en el viento” with Normando Lázara; “Bésame y abrázame” with Mapera; “En el mismo bar” with Ángel Di Rosa, “Mariposa mentirosa” with Mapera and Di Rosa, “El pan que repartió” and the waltzes “Y me enamoré de ti” and “Cuenta nueva” with Mario De Carlo.