Architect Jaime Ortiz Lajous was in charge of the restoration works of the Cathedral of Mexico City in the seventies. I worked under him and supervised the dismantling and reassembling of the two organs, one, of 1695, and the other, of 1735, when they were restored by Flentrop Orgelbouw B.V. in Zaandam, Holland. Once they were functional again, he commissioned me to play them daily for their meintenance. This was an extraordinary gift that furthered my musical career, and now, I can present the fruits of it, namely, compositions for these great instruments. At that time, my co-worker Olga Lavalle had with her a Book of Hours from which I copied some latin verses and set them to music, using the organs of the Cathedral.