If listening to music while reading is your thing, here's a playlist of some of that music :)
(Most assuredly used both NFP + w/o permission.)
Task: Talos Principle - Heavenly Clouds
Standards: Mac Quayle - Impenetrable.sd2
Pebble: Aphex Twin - Kladfvgbung Mischk
The Concert: Disturbed - Down With the Sickness
The House: Nine Inch Nails - 1 Ghosts I
Upstairs: Clint Mansell - The Nursery
Teddy Bear: Silversun Pickups - Dream at Tempo 119
Mirrors: A Perfect Circle - A Stranger
Day: Radiohead - Climbing up the Walls
The Study: The Used - The Bird and the Worm
Dreary: Deftones - Digital Bath
Ripple: Tool - Lateralus
Rooms: Nine Inch Nails - Burning Bright (Fields on Fire)
The Door: Isis - In Fiction
The Hotel: Rob Zombie - Dragula
The Couples: Fever Ray - If I Had a Heart
Staying: Pink Floyd - One of These Days
The Trophy Room: Ozzy Osbourne - Diary of a Madman
The White Room: Marilyn Manson - Tourniquet
The State Room: Korn - Coming Undone
The Cold Room: Rob Zombie - The Girl Who Loved the Monsters
Conjectures: Portal 2 OST - Technical Difficulties
The Showroom: Nine Inch Nails - Beside You in Time
The Free Room: Deftones - Change (in the House of Flies)
Hallways: Rob Zombie - Death of it All
Reason: Portal 2 OST - Acres of Broken Glass
Shells: FFXV - Magna Insomnia
Thorn: Nine Inch Nails - The Background World
Surfaces: Talos Principle - False God
Position: Trent Reznor & Atticus Ross - Soft Trees Break the Fall