More than simply an album, this is the Colombian duo's call to action for a number of different causes close to their hearts. The title track “Rio” (which translates as “river”) urges fans to support the struggle for the recovery of the Bogota River, one of the most polluted in the world. Andrea Echeverri celebrates new life on “0328,” an upbeat reggae song, the title of which refers to the date she discovered she was expecting her second child. The immigration debate is tackled remembered on “Bandera,” with poignant words that look at both the hardships of undocumented aliens who seek better lives for their families and the current administration's position on the matter. Possibly because of these inspirations, or because they were not distracted by solo outings, Aterciopelados were able to give themselves fully to the new project with extremely positive results – Rio emerges as one of their best works in recent years.