There are five bands called Sonar: an ambiental psychedelic rock band from Hungary, a Belgian industrial act, a Swiss minimalist progressive rock act, an italian house/trance act and Polish indie pop 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. For those unfamiliar Read more on Last.fm

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