The sound emerges from steel and concrete, from the periphery to the center, Linha 4 - AMARELA, from Estacao da Luz to Vila Sonia. Subway, streets, and the cadence of the Marginal operating at the edge between loops and improvisation. The dialogue with chance shapes the construction of language and the narrative of territory. Each track is a marker of the journey: C3ntr0, Paul!sta, Marg!nal as fragments of the everyday and of the borders that cut across the urban space. A symbolic construction in which music stands as document and memory. 'L4 / AMARELA', a sonic map of displacement, belonging, and occupation.