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Surdo

The surdo is a large bass drum central to Brazilian samba music, originating from Afro-Brazilian traditions brought by enslaved Africans in the 17th century and evolving into a key instrument in Rio de Janeiro's samba schools by the 20th century. It features a cylindrical shell typically made of wood or metal, with diameters ranging from 16 to 24 inches, and is played with a mallet on one head while the opposite head is struck with the hand or palm for tonal variation, producing a deep, resonant sound that marks the rhythmic pulse. The name derives from the Portuguese word surdo, meaning "deaf" or "of very low sound," reflecting its muffled, bass tone achieved through a high-tensioned construction without snares on the lower membrane. In samba ensembles known as baterias, surdos are categorized into three types: the first surdo, which establishes the basic beat on the downbeat; the second surdo, providing offbeat responses; and the cutting or third surdo, adding syncopated accents to drive the groove forward. These drums are carried via shoulder straps during parades, enabling mobility in large Carnival processions that can involve hundreds of percussionists under the direction of a mestre de bateria. While primarily associated with samba, the surdo also appears in related genres like samba-reggae and axé, underscoring its role as the "heartbeat" of Brazilian rhythmic traditions.

Origins and History

Early Development in

The surdo drum's origins trace back to rhythmic traditions brought by enslaved Africans during the , particularly from the 16th to 19th centuries, blending with bass drums introduced by colonizers. Instruments like the atabaque, used in religious and communal rituals in regions such as , provided foundational polyrhythmic elements, while military and folk bass drums influenced the surdo's larger, tunable design for rhythmic projection in urban settings. This syncretic development reflected 's multicultural fabric, with early bass percussion appearing in 's samba de roda traditions from the 17th century onward. The modern surdo emerged in the 1920s in as samba formalized, with precursors in street music and Afro-Brazilian practices providing deep resonant pulses for emerging rhythms. Pioneers like Donga and João da Baiana contributed to samba's early formation through informal rodas de samba in the , establishing rhythmic grooves that later incorporated larger percussion like the surdo. A pivotal historical event was the 1917 recording of "Pelo Telefone," composed by Donga and Mauro de Almeida, which marked the early foundations of and influenced its evolution toward formalized percussion ensembles in performative contexts. This track, released by , captured proto-samba elements from Rio's street traditions.

Evolution in Samba Music

The surdo drum was introduced into samba music through the founding of Deixa Falar in , recognized as the first formalized in Rio de Janeiro's Estácio de Sá neighborhood. Established by composers including Ismael Silva and Alcebíades Barcelos (known as Bide), the group integrated the surdo to anchor the rhythmic structure of during parades, transforming informal street rhythms into a more organized form suitable for competitive displays. Bide, credited with inventing the surdo, designed it to emphasize the steady pulse, enabling Deixa Falar to parade with a cohesive percussion ensemble that distinguished from earlier traditions. During the 1930s and 1940s, the surdo underwent standardization as the rhythmic backbone of under the influence of key composers like and Cartola. Silva, a central figure in the Estácio group, advocated for the surdo to play the strong second beat in 2/4 time, which coordinated the entire and solidified 's teleco-teco rhythm—a foundational pattern that elevated its danceable . Cartola, through his work with emerging samba schools like Mangueira, contributed to refining the surdo's integration, ensuring it supported lyrical and harmonic developments in compositions amid growing official recognition during the . This period saw the surdo evolve from a simple bass marker to an essential element defining 's national identity. In the post-1950s era, the surdo's role refined further with the expansion of schools and parades, driven by widespread radio broadcasts that popularized the genre nationwide. As schools grew into major attractions, incorporating middle-class participants and larger ensembles, baterias adopted multiple surdo sections—typically first (marcações on the second beat), second (respostas on the first beat), and third (for syncopated variations)—to maintain rhythmic clarity amid hundreds of percussionists. These developments enhanced the surdo's prominence in parades, supporting the emergence of samba-enredo themes and ensuring its foundational pulse resonated in increasingly grand spectacles.

Design and Construction

Physical Characteristics and Materials

The surdo drum features a large cylindrical shell, typically 20 to 24 inches (51 to 61 cm) in diameter and 16 to 24 inches (40 to 60 cm) in depth, designed to produce deep tones as the rhythmic foundation in ensembles. The shell is constructed from durable materials such as laminated wood or for a warm, resonant sound, or lightweight metals like aluminum or for easier portability and sharper projection. It is fitted with two drumheads—a batter head on top for striking and a resonant head on the bottom—secured by metal counter-hoops and tensioned via rods and lugs, allowing precise tuning adjustments. Traditionally, surdo heads were made from animal skins, such as or hide, which provide a full, warm tone with natural sustain but require maintenance like moistening during installation to avoid cracking. In contemporary constructions, synthetic materials like or have become prevalent for their durability, weather resistance, and consistent performance in outdoor settings, reducing overtones and enabling higher tension without breakage. Shell evolution has similarly shifted from solid natural woods to fiberglass-reinforced options in modern variants, enhancing longevity while maintaining acoustic integrity for rigorous use in Brazilian carnivals. Key components include a central , or baqueta, with a wooden or rubber head for striking the batter side to generate the drum's characteristic low-end boom, and the tension system that directly influences —looser heads yield deeper bass, while tighter tuning raises the for varied rhythmic roles. The surdo's acoustic design emphasizes low-frequency , optimized for outdoor projection in large ensembles, where the shell's depth and head tension create a powerful, pulsating that carries over distances.

Sizes, Types, and Variations

The surdo is produced in three standard sizes that correspond to their roles in the samba ensemble: the primeiro, the largest at 22-24 inches in diameter delivering the deepest , the segundo at 20-22 inches providing tones, and the terceiro, the smallest at 18-20 inches with the highest . These dimensions allow for distinct timbres and facilitate the interlocking rhythmic foundation of baterias, where smaller diameters naturally tune higher and larger ones lower due to their acoustic properties. Surdos are typically tuned in relative intervals, such as perfect fifths, with the primeiro at the lowest pitch, the segundo higher, and the terceiro highest, to provide support for the ensemble's groove. Variations include Baiana-style surdos, which are shorter for use in Bahian samba-reggae traditions, as well as distinctions between marching models—designed for mobility with shoulder straps and balanced weight—and stationary versions suited for stage or studio use with stands. Regional adaptations reflect local styles, with samba schools favoring larger surdos (up to 24-26 inches) for powerful projection in parades, contrasted by more compact versions (14-18 inches in diameter, shorter heights of 40-45 cm) in axé music for agile, dance-oriented performances. These differences optimize the instrument for specific cultural contexts, such as the energetic street samba-reggae of .

Playing Techniques

Basic Methods and Strokes

The surdo is typically played in a standing or marching position, with the drum suspended from the player's shoulder using an adjustable strap that positions the instrument at waist height for optimal access to the head. This setup allows for mobility during performances, such as in parades, where the player maintains an upright posture to support the drum's weight, approximately 4 to 9 kilograms depending on size and material. The right hand holds the for primary strikes, while the left hand is used for muting or supplementary palm strikes on the drumhead. The core strokes on the surdo emphasize fundamental bass tones essential to samba rhythms. The open bass stroke involves a full, resonant hit with the mallet on the center of the drumhead, producing a deep "boom" that sustains and provides the foundational pulse. For the muted bass, the left hand immediately dampens the head after the mallet strike or presses against it during the hit, creating a shorter "thud" with reduced resonance for rhythmic definition. Rim shots, used for accents, are executed by striking the rim or hoop with the shaft of the mallet, generating a sharp, higher-pitched crack that cuts through ensemble sounds. Mallet types vary to suit tonal needs, with soft-headed mallets featuring plush, felt, or cloth coverings on wooden shafts preferred for controlled, warmer tones in indoor or smaller group settings. Harder mallets, such as those with solid wood or firmer rubber heads, are employed for greater volume and projection in outdoor performances. Basic maintenance involves periodic replacement of the drumhead, typically made of or synthetic material, to preserve tension and sound quality, often requiring tools like a wrench for adjustments. To ensure safety and during extended performances, should adjust the to distribute weight evenly across the shoulder and back, avoiding slouching by engaging core muscles and keeping feet shoulder-width apart for stability. This prevents strain on the lower back and shoulders, particularly important given the physical demands of for hours in hot conditions. Regular breaks and routines focused on the wrists, arms, and posture are recommended to mitigate repetitive stress injuries.

Rhythmic Patterns in Performance

In samba performances, the surdo drums form the rhythmic foundation through distinct patterns assigned to each type, creating a layered groove essential for synchronization in the bateria ensemble. The primeiro surdo, the largest and lowest-pitched, typically provides a steady response on the second beat in 2/4 time, establishing the primary pulse that anchors the ensemble's momentum. The segundo surdo complements this with a calling pattern on the first beat, initiating the call-and-response dynamic that propels the music forward. Meanwhile, the terceiro surdo delivers a foundational quarter-note drive, often emphasizing the second and fourth beats while incorporating syncopated elements for added drive. Layering these patterns in a results in interlocking rhythms that generate the characteristic groove, where the surdos' overlapping pulses create a sense of forward motion and density. For instance, the primeiro and segundo surdos' alternating beats form a foundation, while the terceiro's variations—such as cortes (cuts) on off-beats—introduce brief interruptions that heighten tension and release. Accents like the surdo martelo, a forceful "" strike, are frequently employed by the primeiro or terceiro to punctuate key moments, reinforcing the ensemble's . This interplay ensures precise synchronization, with performers listening intently to maintain alignment across the group. Performances often occur at tempos ranging from 120 to 140 beats per minute, particularly during settings, allowing for dynamic shifts that build through gradual accelerations or ritardandos. To achieve this , musicians employ practice methods such as exercises to internalize the pulse and group drills that simulate interactions, starting at slower speeds before scaling to full .

Musical Applications

Role in Rio-style Carnival Samba

In Rio-style Carnival samba, the surdo serves as the rhythmic core of the , the percussion ensemble that propels the parade through the Sambódromo avenue. Comprising approximately 20-30% of the bateria's members—typically 40-50 players in a group of 250-300 percussionists—the surdos provide the foundational bass pulse that synchronizes the dancers, singers, and floats, ensuring the 82-minute performance maintains unrelenting energy and cohesion. The orchestration of surdos is structured around three voices, each contributing distinctly to the samba-enredo's rhythmic framework. The surdo de primeira, the largest and lowest-pitched, marks the primary beat (often on 2 and 4 in Mangueira's style) and signals transitions between sections of the theme, guiding the overall . The surdo de segunda responds with counter-rhythms, filling harmonic layers to sustain momentum during rests in the primeira. The surdo de terceira, the smallest and highest-tuned, anchors accents and cuts (cortes) that emphasize syncopations in the enredo, adding dynamic cuts and responses to heighten the parade's intensity. Iconic examples of surdo integration appear in parades by schools like Estação Primeira de Mangueira and Portela during the 1980s and 2000s, where surdo sections were choreographed into visually striking formations—such as synchronized marches and paradinhas (brief halts for flourishes)—to amplify the thematic narrative and audience engagement. Mangueira's innovative use of only two surdo voices in this era, emphasizing the primeira's deep resonance, became a signature element in their championship-winning displays, blending auditory power with performative spectacle. The surdo's role has evolved alongside competition judging, with criteria formalized since the 1932 inception of Rio's samba school contests and refined by organizations like AESCRJ (until 1984) and its successor LIESA. Under LIESA's standards, the bateria quesito evaluates surdo precision through metrics like rhythmic regularity, instrumental harmony, and exact execution of accents, penalizing inconsistencies that disrupt the parade's flow; these elements have been pivotal in determining rankings, underscoring the surdo's status as the ensemble's indispensable anchor.

Use in Other Brazilian Genres

In , a subgenre that emerged in the intimate backyard gatherings of , the surdo adapted to smaller sizes suitable for compact ensembles, providing a foundational pulse while allowing space for syncopated rhythmic fills that enhance the genre's conversational flow. Groups like Fundo de Quintal incorporated the surdo alongside instruments such as the , , and repique de mão, creating a balanced acoustic texture for unplugged performances that emphasized subtle dynamics over large-scale volume. In axé music and Bahian styles, larger surdos became central to high-energy street performances during the 1990s, particularly in the samba-reggae ensembles of Olodum, where they were divided into four interlocking bass lines to drive propulsive, activist-infused rhythms. Founded in 1979 in Salvador, Olodum's percussion section, featuring these deep-toned surdos layered under repique drums, propelled the bloco afro movement and influenced axé's global spread through Carnival processions and recordings. In modern fusions, the surdo features prominently in (MPB), as heard in Marisa Monte's productions like the 2000 album Tudo Azul with Velha Guarda da Portela, where its booming tone anchors stripped-down tracks amid and . Since the 2010s, surdo samples have enriched electronic remixes, providing authentic bass grooves in tracks that layer digital effects over traditional percussion for dance-oriented hybrids.

Cultural and Social Significance

Importance in Brazilian Traditions

The surdo plays a central role in blocos afro and favela-based schools, serving as a foundational for fostering and education since the . Emerging during a period of heightened black consciousness in , blocos afro such as —founded in 1979 in —incorporated the surdo into their percussion ensembles to amplify Afro-Brazilian rhythms during parades, creating communal spaces where marginalized from favelas could learn discipline, teamwork, and cultural pride through collective drumming. These groups transformed informal street rehearsals into structured educational environments, emphasizing the surdo's deep bass tones to unify participants and instill values of resistance against racial exclusion. Symbolically, the surdo embodies resistance and joy in traditions, particularly through its prominence in movements led by blocos afro. Groups like used the surdo's commanding pulse to lead parades that celebrated heritage and critiqued systemic , turning the drum into an emblem of empowerment for Afro-Brazilian communities amid . Its booming sound during these events not only drove the energy of collective celebration but also asserted cultural agency, transforming into a platform for social protest and identity affirmation. Educational programs such as Neojiba in leverage the surdo within percussion training to advance and social inclusion for at-risk youth. Since its founding in 2007, Neojiba has engaged approximately 2,360 young participants from vulnerable backgrounds (as of 2025) in orchestral and percussion activities, using instruments like the surdo to build emotional , foster community bonds, and provide pathways out of through structured musical . This approach highlights the surdo's therapeutic potential in promoting personal growth and societal integration in 's diverse urban settings.

Global Adoption and Influence

The surdo drum's global spread began in the 1970s through communities establishing samba groups in major cities like and , where immigrants and political exiles introduced the instrument as the rhythmic foundation of ensembles. In , early Brazilian expatriates formed informal percussion groups amid the growing Latin American community, adapting the surdo for street performances and cultural events that echoed Rio's traditions. Similarly, in , samba drumming emerged around 1975 with groups like Robin Jones' ensemble, which incorporated surdo alongside other Brazilian percussion at events such as the Carnival, laying the groundwork for formalized schools like the London School of Samba founded in 1984. The surdo's influence extended into and fusion genres during the late 20th century, notably through its integration into Paul Simon's album The Rhythm of the Saints, where Brazilian percussionist Gordinho played surdo on tracks like "," blending it with Bahian rhythms from to create polyrhythmic layers that popularized elements in mainstream pop. In , the surdo's bass pulse was translated to drum kits and ensembles, influencing subsequent works by artists exploring Afro-Brazilian grooves. In modern contexts, the surdo features prominently at international festivals, such as the UK's since the 2000s, where samba bands like Bloco B and Dendê & The Banda have performed sets incorporating the drum's deep tones to energize crowds and highlight Brazilian heritage. Post-1980s adaptations appear in Japanese samba schools, spurred by the dekasegui migration of Japanese-Brazilians from to , who established groups in cities like Oizumi and , modifying surdo patterns to blend with local influences while preserving core rhythms. This expansion has sparked debates on cultural appropriation since the , with critics arguing that non-Brazilian groups often commodify drumming without acknowledging its Afro-Brazilian roots, as explored in analyses of global scenes where the surdo becomes detached from its social context. In response, Brazilian expatriates have led preservation efforts, founding authentic schools abroad—such as in the UK and —to teach traditional surdo techniques and combat dilution, ensuring the instrument's cultural integrity amid worldwide adoption.

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