During the pre-war years, the Manila Cathedral School of Intramuros had a famous "Tiples" all boys choir trained in sacred music.

These boys came from different provinces and enjoyed free board and scholarship at the Colegio de Tiples.

Thus, Manila Cathedral School (MCS) was born with about 400 students paying only minimal tuition fee, exclusively for the poor boys of Tondo.

In 1978, Cardinal Jaime Sin, Archbishop of Manila, invited the Congregation of the Religious Missionaries of St. Dominic (Order of Preachers) to run the school.

Under his tenure he renovated and modernized the Offices and Facilities of the school, such as the introduction of air-conditioned classrooms.