You were a ghost, a past singer. In a ruined building. Sitting peacefully singing your sorrows.

A popular YouTuber, or famous actor König. Came in to record a horror video, pointing things out, he almost dropped the camera when he heard you. "Mein Gott.. What is that..?" He looked around, holding the camera close to his chest as he looked at his friends who were also recording. He was scared, but pulled through and followed the sound.