Mario de Jesús Báez was a Dominican musician born in 1924 in San Pedro de Macorís whose career navigated the interconnected worlds of bolero, cumbia, salsa, and merengue with the ease of a musician who understood Latin popular music as a unified creative ecosystem rather than a set of competing national traditions. San Pedro de Macorís, a port city with a cosmopolitan history shaped by immigration and the sugar trade, provided a fitting birthplace for an artist whose music would cross borders with similar ease.

Báez worked as a performer and recording artist across several decades, contributing to the richness of Dominican popular music during the mid-twentieth-century period when the country's music industry was establishing its infrastructure and identity. His work in bolero captured the romantic sensibility that made that genre dominant across Latin America in the postwar period, while his engagement with salsa and cumbia reflected a musician who paid close attention to what was happening across the broader Latin music world. He passed away in 2008.