DJ Heartstring is the Berlin-based duo of Leon Alexander and Jonas Demnitz, torchbearers of the Y2K trance revival that's swept European dancefloors since the early 2020s. Their sound pairs euphoric, high-BPM trance melodies with a raw, club-first energy — nostalgic without ever tipping into parody. From breakout releases on their own No Emotions label to festival main stages and sold-out club dates worldwide, they've become one of the defining acts of the new trance wave.