In Verruf

In Verruf is the alias of Ferdinand Hartmann, a techno artist from Berlin, Germany. He also produces under the name Dance or Die and began releasing music in July 2021. Since his debut, he has released 11 tracks across multiple labels in the electronic music scene.

His sound spans hard techno and peak time driving techno, with occasional ventures into raw, deep, and hypnotic trance territories. In Verruf releases on R - Label Group, NineTimesNine, and 44 LABEL GROUP, with his most recent output appearing on Curation Best Of 2025 in December 2025. His productions target the harder end of the techno spectrum, designed for peak time dancefloor moments with driving energy and hypnotic elements that work across both techno and trance sets.