Racionais MC's is a hip hop group based in São Paulo, Brazil. Mano Brown , Ice Blue , Edi Rock and DJ KL Jay formed the group in 1988. Each member hails from the ring of favelas around São Paulo locally called the periferia. Their lyrics combine themes of social justice with gangster imagery, a far cry from the idyllic breeziness typically associated with Brazilian rap music, Racionais Mc's is often considered the most important Brazilian rap group.