Algunas de sus interpretaciones para Lomax se publicaron en la colección de CDs The Alan Lomax Collection. The Spanish Recordings. Extremadura (Rounder Records, 2001). 

En la caja de la cinta original, Lomax anota que las grabaciones fueron realizadas por un grupo de cuatro mujeres de edad avanzada, enlutadas, que servían a "mozas". 

These are four old women serving maids-mozas. The contact is Maestro Calem, who has all the songs written down from his childhood-is now removed a romantic [...] from the [...] of country life, has romanticized the tunes a bit, has front to help him and besides has a young voice whereas these of his `...] has erected with time hardwork and thill bearing. They don't sing the songs as pretty as he recalls them, and he sits upon his nice [...] and [...] his confortable spectacles and harcut directing them with his fine hands, telling htme, Hombre, the song was showsn when I was young. That's the tune of another ballad, they tune that I recall is well as yesterday does like this "The old ladies resist him shoutly as possible "Vine always sung it this way in our town, in this tierra, mayby you camed it somewhere else
​The four old women are in black, their faces are like the [... brown fields of Extremadura, swere, yet smiling from the sun, they live love their ballads, their voices are tune to the old stories, there is no fothing when they come to the heddings and the heatigs because there was never a temor in their lives when their grain dusty [...] on with thighs or sticks.

En sus notas de campo (03.02.25), Lomax indica que esta informante era la líder del grupo, que era viuda y que era en el fondo una poetisa ("makes sweets and speaks orations at funerals - she is inside a poet, having written her life in verse and also a full account of the Romeria of the Virgin... She is a widow. [...] expressive person, good at bargains").

Entre las notas de campo de Lomax encontramos un impreso, que debía estar inserto en la libreta de campo, que es precisamente la "Fiesta de nuestra Patrona de Virgen de la Luz / Escrito por Marcelina Diaz Gimenez (de 65 años de edad)". Es un pliego doblado como cuatro páginas en tamaño cuartilla impreso a dos columnas. La fecha es "Arroyo de la Luz - 2 abril -1948". En la cuarta página encontramos otra obra: "Salutación a la Virgen de Fátima al pasar el cruce de carretera de Aliseda a Arroyo-Malpartida" con fechas de 20 de mayo de 1947 y 31 de mayo de 1948.

Posteriormente se produjo un intercambio de cartas entre Lomax y esta informante, a la que Lomax pidió que escribiera la historia de su vida.