Mariela Mercado Pérez is a Dominican singer from Santo Domingo and one of the founding voices of Grupo 440, alongside Juan Luis Guerra, Maridalia Hernández and Roger Zayas-Bazán. Trained in architecture, she chose a musical career that extended from the quartet's soprano parts to advertising jingles, backing vocals and her solo album «Sola».

From architecture to the recording studio

She began singing in her school's tuna, where Alex Mansilla played guitar. While studying architecture, first at the Universidad Nacional Pedro Henríquez Ureña and then at the Universidad Autónoma de Santo Domingo, she joined «Módulo», a vocal group of architecture students. She later recalled that singing in harmony with that group helped her discover the possibilities of ensemble work.

Mansilla introduced her to Manuel Tejada, who was preparing a production of «Jesucristo Superestrella». Her participation brought her into contact with Juan Luis Guerra and Maridalia Hernández, and led to paid work singing advertising jingles. She completed her architecture degree but decided to make music her profession. In her account, she did not obtain a professional licence or establish an architectural practice.

The first voices of 4.40

Maridalia Hernández invited Mercado to try vocal transcriptions that Juan Luis Guerra had brought back from Berklee. At first they rehearsed with Felipe Sánchez; Roger Zayas-Bazán subsequently took his place. The singers initially met for the pleasure of singing together, before those rehearsals became Grupo 440.

Mercado described her usual part as soprano, with Guerra assigning the vocal parts and lead passages. She sang on the group's early recordings, including «Soplando», «Mudanza y acarreo» and «Mientras más lo pienso… tú», and continued with the ensemble through «Ojalá que llueva café». Recalling the studio sessions, she emphasized Guerra's exacting approach and the singers' close involvement in the recording process.

Leaving the tours, continuing to record

As international touring intensified, Mercado chose to leave the group to spend more time with her young family. Adalgisa Pantaleón initially covered her maternity leave and remained in the ensemble after Mercado's departure. That change ended her regular touring with 4.40, rather than her work as a musician.

She continued recording jingles and backing vocals. A studio in the home she shared with Manuel Tejada, then her husband, allowed her to combine recording sessions with raising her children. She has described studio singing, with its opportunities to refine and repeat a passage, as the work she most enjoyed.

«Sola» and later work

Tejada encouraged her to record «Sola» as a document of her own voice. Frank Ceara and Quico Rizek helped her select the repertoire and develop the album's musical direction. Mercado did not follow it with a sustained touring career as a solo artist.

She later developed a business in gastronomy, having taken an online course through Ashworth in Georgia. In her 2022 interview she explained that she still accepted occasional recording and voice work, while maintaining her friendship with the original 4.40 singers.

Legacy

Mercado's career connects the original vocal quartet of 4.40 with the Dominican studio tradition of jingles and backing vocals. Her departure from international touring redirected her professional life toward recording, while «Sola» preserved a project under her own name.