Valters and Kaža, known internationally as Walters and Kazha, were a Latvian music duo consisting of Valters Frīdenbergs and Kārlis Būmeisters. They were best known for representing in the Eurovision Song Contest 2005 with the song "The War Is Not Over", written by Mārtiņš Freimanis, finishing in fifth place with 153 points. At the after-party, Valters lost his voice and subsequently, at the dress rehearsal, he did not sing the entire song. In the grand final, he sang parts of the song one octave lower than they should've been. Despite this, they finished in fifth place with 153 points.
Two years later, the duo provided the Latvian commentary for the Eurovision Song Contest 2011. Valters was also Latvia's spokesperson at the Eurovision Song Contest 2012.