Antônio Lago wrote one of the most praised Brazilian songs of the mid-'40s, "Deslumbramento" (lyrics by Raimundo Lopes). Recorded by Francisco Alves, it christened a broadly popular Rádio Nacional soap opera and also was its theme. Lago also wrote several other compositions, three of them were recorded by the singer Roberto Vilmar.
Moving to Rio de Janeiro from his hometown in 1906, Lago dedicated himself to the music of theater, having been invited to direct the choir of the Teatro Colon, in Buenos Aires, Argentina. Lago's son, Mário Lago, became a famous composer, lyricist, actor, and writer.