There are four bands called Sonar: an ambiental psychedelic rock band from Hungary, a Belgian industrial act, a Swiss minimalist progressive rock act and an italian house/trance act. about the Belgian one:
During the last ten years sonar has become one of the most well-known and appreciated rhythmic-industrial projects. Countless releases and high-energetic live performances assured their top position in this genre.

Read more about Sonar on Last.fm.