In this case, Puerto Rico, its participating broadcaster Telemundo and its entrant Nydia Caro were the winners of the previous year's show with the song "Hoy sólo canto por cantar".

The channel, which had been created by the businessman Ángel Ramos, was in 1975 one of the main media companies in the island before expanding to the Spanish speaking communities of the United States of America.

The participating song, entitled "La felicidad," composed by Felipe Gil and performed by Gualberto Castro, won the national final and got the ticket to San Juan.

The participating TV channel again internally selected the well-known female singer Mirla Castellanos, who had already represented her home country back in 1972 in Madrid.

The performance round was opened by Bolivia and their entrant Óscar Roca with his song "Por esas cosas te amo" (For things such as those I love you) which did not receive a warm welcome.

The host country, in this case, Puerto Rico and their entrants, the New York City-based band Los Hispanos, were the eleventh ones to take the stage with their song "¿Adónde vas amigo?"

(A flower in the balcony) (I'm like the wind, I'm like the sea) (Life is unquiet) (I want to compose the world with my own hands) The voting system followed the same dynamics of the previous years in which the juries were contacted telephonically by the presenters.

This time there was an enormously clear victory from the Mexican entrant Gualberto Castro whose song "La felicidad" was warmly welcomed by the national juries of the participating broadcasters.

The second Classificate Cecilia had already a successful career in Spain but her second place in the OTI Festival supposed for her leap to the Latin American audience in which she also enjoyed a moderate but growing popularity.

The third position of the Venezuelan performer Mirla Castellanos with a record of points awarded to her country lead to the consolidation of her career both in Venezuela and in Latin America.

This time, the viewing figures were slightly lower due to the technical issues that Telemundo had to face during the international airing of the OTI Festival outside Puerto Rico.

As was the case two years before with Imelda Miller, the Mexican audience saw with great interest the victory of their contestant Gualberto Castro and he was warmly received back in Mexico City.