There are more than one artist with this name.
1) Riva was a pop band from Croatia, then Yugoslavia, in the late 1980s. The group debuted on Zagrebfest 1988. Their song Rock Me won the Eurovision Song Contest 1989 in Switzerland, with a score of 137 points. After a fallout with a Swiss record label they signed to, they went on a hiatus in 1991, which became permanent as members focused on their personal lives. Small reunions took place between 1993 and 2016. Read more on Last.fm