"In those days, opera was what was studied, but I chose romantic ballads because it was what my father sang and I began listening to his music very early in life."

He began his artistic career as a backup dancer when he was 14 years old in the Teatro Blanquita, located in downtown Mexico City.

They recorded numerous albums; one of their most famous hits, "Yo sin ti", written and arranged by Arturo Castro, became a popular song throughout Mexico and South America.

CBS later released a composite CD / DVD of Los Hermanos Castros singing and performing live filmed and recorded during the 1960s.

When returning to Mexico, Los Hermanos Castro decided to go their separate ways, each successfully developing a career in music.

Gualberto embarked on a solo singing career, recording one album a year and appearing in numerous night clubs, theaters, movies and television; he was a long time emcee for La Carabina de Ambrosio, a popular weekly television show during the early 1980s that co-starred the magician Beto "El Boticario" and dancer Gina Montes.

Castro entered and won the fourth edition of the OTI Festival (Organización de Televisión Iberoamericana) award twice, once in 1975 for "La felicidad", written by Felipe Gill.

Gualberto and his wife designed the album cover with himself lying down between the shapely legs of dancers who stood in French-cut leotards above him.

In 2010, the NFL used Gualberto Castro’s signature song "La Felicidad" for a commercial promoting American football to Spanish-speaking audiences.

[3] He died in Zona Rosa, Mexico City on 27 June 2019, due to health complications arising from treatment for bladder cancer, among which was a pulmonary infection.