Trettmann grew up in the Fritz-Heckert-Siedlung in what is now Chemnitz. In the past, the estate was the largest new housing development in the GDR: a place that stood for progress and prosperity, which was supposed to offer its residents social status and comfort. Even as a child, he was able to listen to the latest R'n'B and disco hits on the West German radio because of the Heckert area's favorable elevation; later, he was fascinated by rap and breakdancing. In the early nineties, reggae and dancehall from Jamaica were added. Trettmann was a teenager when the Wall fell. With the fall of the Berlin Wall, his surroundings changed. His settlement degenerated into a social hotspot, friends and acquaintances fell away around him. Amid the changing times, he discovered music as his personal escape. He began hosting parties, moved to Leipzig to start his own sound system, and eventually sang in German. But despite the scene hype, the breakthrough wouldn't come.
2017 became his personal turning point year. With the release of his second album #DIY, Trettmann achieved his big breakthrough. #DIY became a modern classic that crossed genre boundaries by combining dancehall, trap and grime elements. This unique style makes Trettmann one of the most sought-after artists in Germany to this day.
His 2019 released album "Trettmann"shoots directly to number 2 in the German charts. After the Corona break and a sabbatical of a total of three years, Trettmann returned in 2023 with his album "Insomnia", which also closes the common era with KitschKrieg. In the album Trettmann processes the separation to his life partner of many years. It is about the end of a love, about sorrow and pain, but also of new beginnings.