Their mother, Isabel Asmussen Urrutia, was a singer, and their father, Luis Soublette García-Vidaurre, took them to choral concerts.
In 1941, while studying at the Colegio de los Sagrados Corazones, she founded the Coro Femenino Viña del Mar.
They had three children (Maximiano, Juan Gabriel and María Gracia) and adopted a fourth (Enrique Bravo, son of their housemaid).
[7][9] Soublette studied music privately with Alina Piderit[10] and at the Conservatorio Nacional de Música with Federico Heinlein, Clara Oyuela, and Domingo Santa Cruz.
She received a scholarship from the French government in 1951 to study at the Paris Conservatory with Darius Milhaud and Olivier Messiaen.