Dopplereffekt is an American electronic music duo formed in the mid-1990s, known for their influential contributions to the genres of electro and techno. The group consists of members Der Zyklus (who is often associated with the project) and a vocalist known as "Toñito." They are recognized for their distinctive sound that combines intricate melodies, robotic vocals, and a futuristic aesthetic, often exploring themes related to technology and science fiction. Their work is characterized by innovative production techniques and a style that pays homage to the classic sounds of early electronic music while pushing the boundaries of the genre. Dopplereffekt has released several albums and EPs, gaining a cult following within the electronic music scene.