Create a cinematic horror background score for a short film set in a haunted, half-constructed building at night. The music should start with eerie ambient pads, distant unsettling whispers, and subtle wind sounds. Gradually build tension with faint metallic creaks, reverb-heavy knocks, and ghostly textures. Add low, rumbling bass drones as the characters explore the building. During phone call scenes, introduce glitchy static sounds and distorted synths to create a sense of unease. For sudden disappearances, use sharp string stabs and quick rise in tension. End with deep, heart-thumping bass hits, reversed effects, and an abrupt silence to leave a chilling impact. Keep it dark, atmospheric, and cinematic.