So Bajofondo brings in guest vocalists as wild cards : singers including Nelly Furtado , Elvis Costello , the Argentine rockers Gustavo Cerati and Juan Subirá , the Mexican rocker Julieta Venegas and the octogenarian Uruguayan tango singer Lágrima Ríos , in her last recording , as well as rapping by Mala Rodriguez ( from Spain ) and Santullo ( from Uruguay ) .