In 1926, Flores went to
New York City without having any formal musical education. There, he joined another
Puerto Rican composer,
Rafael Hernández, in his
Trío Borinquen. Even though Flores and Hernández became very good friends, they also became competitors as composers. When Flores wrote "Sin Bandera," Hernández rushed to write
Preciosa. In 1930, Flores formed his own trio called "Trío Galón.” The group’s music differed from “Trío Borinquen,” with the use of faster beats. When Flores began to have problems with the music publishing company, he made the decision to leave the trio
. Flores eventually returned to New York where he reconstituted his former trio. Some of the singers of this new trio were
Myrta Silva,
Daniel Santos and
Pedro Ortiz Dávila, known as "Davilita". ==Musical compositions==