Brazil's foremost ensemble of the late twentieth century, Grupo Novo Horizonte de São Paulo, transformed Brazilian contemporary music by cultivating a new mixed-chamber repertory and giving sustained support to a generation of emerging composers. That this cosmopolitan group took, then outgrew, the Pierrot ensemble as its cornerstone signals the medium it forged: a localized, evolving spectacle with a richly internationalist heritage. This article offers a panoramic view of the musical, intercultural and historical contexts that underpin Grupo Novo Horizonte's practices and legacy. Analysing landmark works by Sílvio Ferraz, Harry Crowl and others allows us to draw further connections between the group, the Brazilianness of late twentieth-century compositional aesthetic, and the realities of contemporary classical music-making in Brazil.