[2] Befriended by The Gills, a brother and sister vaudeville team, Sergio was asked to perform his own material during their costume changes at the Winter Garden Theatre in Manhattan.
Irving Berlin, fascinated by the young man's knowledge of Afro-Cuban rhythms, offered Sergio a publishing contract for one of his compositions called "Bagoo", a song about island life in Cuba.
At this time, Sergio made his Mexican debut at the Olympia Theatre in Mexico City, where he wrote several songs for a new movie, including the ballad "Flores Negras."
It also became an international hit, eventually being recorded by artists such as Bing Crosby, Gene Autry, Lawrence Welk, Eydie Gormé with Los Panchos, Ana Gabriel and many others.
As his career flourished in New York City, Sergio was invited to Hollywood to audition for the leading role in the picture The Life of Rudolph Valentino.
After achieving great success for many years in Mexico, Sergio eventually moved to Los Angeles, California where he continued to compose and arrange his music.