As it is something useful nowadays to put some ambiance during a session, why not share some kind of soundtrack ?
Myst II OST - Gehn's Theme
John Carpenter's The Fog - Main Theme
John Carpenter's Prince Of Darkness - Main Theme
The Last Of Us OST - The Outbreak
The Protomen - How The World Fell Under Darkness
Xenogears OST - The One Who Is Torn Apart
Silent Hill OST - Over
Twin Peaks OST - Night Life in Twin Peaks