Three sonic markers define this school. First, bi-modality — Indigenous pentatonic scales stacked over Western functional harmony, producing the characteristic bittersweet friction of the Latin American concert repertoire. The most famous instance is Villa-Lobos's Bachianas Brasileiras No.5 Aria, where eight cellos play Bach-inflected counterpoint while a soprano floats a pentatonic Brazilian folk melody on top. Second, mestizo rhythm — hemiola figures (2:3), simultaneous 6/8 and 3/4, and Afro-Cuban 3-2/2-3 clave patterns embedded in the orchestral inner voices. Third, the elevation of percussion to structural parity with strings: teponaztli (Aztec slit drum), claves, bongos, and reco-reco carry thematic material, not just color. Standard scoring is symphonic orchestra and chamber ensemble; piano and guitar (Ponce's Concierto del Sur) emerge as favored solo instruments.

The movement crystallized in the political aftermath of national reinvention: Brazil's 1889 republican transition, Cuba's 1902 independence, the 1910 Mexican Revolution, Argentina's 1916 Radical Party government. A generation of composers returning from European conservatoires made 'what is our national sound?' their central compositional problem. Villa-Lobos foregrounded Indigenous and Afro-Brazilian material at the 1922 Semana de Arte Moderna in São Paulo. Carlos Chávez modernized Mexico's National Conservatory from 1928. Alberto Williams had founded the Buenos Aires Conservatory as early as 1893, training the Argentine generation from within. The Rockefeller Foundation's Good Neighbor cultural exchange (1938-45) brought Villa-Lobos and Chávez to North American premieres and completed a pan-American art-music network. The school stood politically against European centrism, but was later critiqued for symbolic appropriation of Indigenous materials without addressing the living conditions of Indigenous people themselves.

In Bachianas Brasileiras No.5, the opening cello ensemble sounds like a Bach siciliano until, ten seconds in, the soprano enters with a plainly Brazilian folk melodic contour; you suddenly hear two centuries and two continents at once. Sensemayá builds over a 7/8 ostinato — the piece is a controlled crescendo of percussion layers culminating in a screaming brass tutti at 6:00. The Malambo finale of Estancia is a four-minute non-stop acceleration of 6/8 gaucho men's dance, ending on a snapped fortissimo. Rítmicas V by Roldán is a three-and-a-half-minute percussion-only movement — batá drums, congas, claves, reco-reco — written a full year before Varèse's Ionisation, and the direct ancestor of every twentieth-century percussion-ensemble score that followed.

Start with Sensemayá (Revueltas, 1938, seven minutes). Its three-part structure — low percussion drone, gradual instrumental accumulation, brass climax — makes the arc audible on first hearing. Then Bachianas Brasileiras No.5 Aria (Villa-Lobos, 1938, six minutes), a small jewel. Finally Estancia Suite (Ginastera, 1941, twelve minutes) for the Argentine voice. Together those three cover the movement's Mexican, Brazilian, and Argentine centers. Gustavo Dudamel's LA Philharmonic recordings from the 2010s are the standard modern reference.

Amadeo Roldán's Rítmicas V (1930) predates Varèse's Ionisation (1931) as the first percussion-ensemble piece by a Western-trained composer; the historical spotlight nonetheless fell on Varèse for decades. Astor Piazzolla, Ginastera's most famous pupil, was later told in Paris by Nadia Boulanger 'write tangos — that is where your real music is.' Boulanger's advice was, in effect, a distant echo of Ginastera's nationalist convictions. Villa-Lobos taught music education in Rio's public schools from 1932 and personally trained thousands of Brazilian schoolteachers; the movement was not only for concert halls but was consciously built into a national pedagogy.