Marie Cécile Larreguy was born in 1821 in Paris to her parents, François Dominique Larreguy and Louise Cécile Guérin de Foncin, who had tied the knot in 1817. In 1839, she entered wedlock with Bernard Théodore Galos in Angoulême. Her spouse was a wine merchant and the son of Gironde deputy Jacques Galos. Notably, her father was serving as the prefect of Charente at the time. The Galos family decided to make Bordeaux their home, and it was there that their son Jacques was born in 1841, followed by their daughter Henriette Cécile Marie in 1845. The family's fortunes took a somber turn in 1873 with the passing of Théodore Gallos, just a month before his daughter's wedding to Louis Roche. This event marked the transition of the family wine estate into the hands of Louis Roche. Regarding her professional pursuits, available information is regrettably sparse and insufficiently detailed. Notably, in 1855, she commenced her journey as a composer, primarily focusing on the creation of nocturnes and waltzes for the piano. Her life journey came to a close in 1903 at her residence on 50, allées Damour in Bordeaux. It is worth noting that Marie Cécile Larreguy published her musical works using various pseudonyms, leading to a degree of uncertainty regarding her gender. This uncertainty was ultimately resolved with the discovery of one of her early publications, a nocturne titled "Lac de Côme" (op. 24), signed under the name "Mademoiselle Giselle Galos." This revelation firmly established her identity as the composer.