Cuban Son didn't begin in the bustling dance halls of Havana. Its roots are in the rural eastern part of the island, in a style known as son de monte (son of the mountain). This early form was rustic, played on whatever instruments were available. But as people migrated to the cities in the early 20th century, the music came with them and began to change. It needed to be louder, more structured, and suitable for urban nightlife.

The first standardised urban format was the sexteto, or sextet, which became popular in the 1920s. This lineup blended Spanish-derived string instruments with African-derived percussion, creating a perfect balance. The combination of the tres guitar, with its unique tuning and rhythmic punch, playing against the steady pulse of the bass and the intricate patterns of the bongos, laid the harmonic and rhythmic groundwork for everything that followed.

As Son's popularity grew, it moved into larger, noisier venues. The sextet format, while musically rich, struggled to cut through the sound of a crowded dance floor. The solution was simple but revolutionary: add a trumpet. This transformed the sextet into a septeto (septet) and fundamentally changed the music's texture. The trumpet brought a powerful, piercing melodic voice that could soar over the rhythm section, introducing European-style melodic phrasing to the Afro-Cuban core.

This addition marked a key shift from a more rural, string-based sound to a polished, urban style. Groups like the famous Septeto Habanero defined this new sound, creating sophisticated arrangements that captivated audiences in Havana and, soon, the world. The trumpet didn't just add volume; it added a new layer of musical conversation, trading lines with the singer and enriching the harmony.

Perhaps the most important structural innovation of this era was the formalisation of the montuno section. This is typically the final part of a Son song, where the energy lifts and the focus shifts to improvisation and rhythm. It's built around a call-and-response pattern between the lead vocalist (sonero) and a chorus (coro).

This structure gave Son its dynamic arc. The song would start with verses, move to a chorus, and then build to a climax in the montuno, where the band could stretch out and the dancers could really shine. This two-part structure (verse/chorus followed by montuno) became the foundational template for modern Salsa arrangements.

This powerful musical form, forged in the cities and built on a rural foundation, was ready for its next journey. The migration of Cuban musicians to places like New York City would eventually expose Son to new influences, leading to the creation of Mambo and, ultimately, Salsa.

Let's check your understanding of these foundational concepts.

Understanding Son's evolution is key to seeing how it provided the essential DNA for Salsa. The instrumentation, the structure, and the rhythmic feel all began here.