Timo Kross hadn’t slept in forty-eight hours. The walls of his Berlin studio were sweating, and the only light came from the icy blue glow of his cracked laptop screen. He was hunting for the sound. That specific, rusty, pneumatic stab of noise that would finally crack his skull open and let the music pour out.

One message contained only a photograph. A blurry, black-and-white shot of the same maintenance corridor, but from a different angle. A fresh hole in the brickwork. And a note taped to the wall, written in a shaky hand:

HAT_STEAM_PIPE.wav was the screech of a century-old heating pipe warming up, recorded with a contact mic. It had a metallic, shuffling swing no drum machine could replicate.

He didn't click.