E1M1: Detention Facility 
Author: myolden
Music: Nightfall by stewboy

E1M2: Admin Offices 
Author: Peccatum Mihzamiz
Music: Dancing Snakes by Stewboy

E1M3: Barracks
Author: Doomlust
MIDI: Source of Stress by Doomkid and Jimmy 

E1M4: Mineral Processing
Author: Death Bear
"Pistons" by James Paddock

E1M5: Mining Complex
Author: RataUnderground 
MIDI: The Antrax Solution by Varis Alpha

E1M6: Visitor Center
Author: Shawny
MIDI: Goldrush by Stewboy

E1M7: Traffic Control
Author: LoreCaco37 
MIDI: Atomic by Jimmy

E1M8: Huygens Spaceport
Author: ViolentBeetle
MIDI: End is Nigh by Jamie Robertson

E1M9: Excavation Area
Author: LateNightPerson 
MIDI: Half-Life 2 - You're Not Supposed to Be Here by Kelly Bailey

E2M1: Piazzi Spaceport
Author: Lorenz0
MIDI: Reaching Deeper by Eris Falling

E2M2: Storage Complex
Author: Wavy
MIDI: The Demons From Adrian's Pen remix by Jay Reichard

E2M3 Stock Exchange
Author: DFF
Music: Car dealership from Gran Turismo 3 (sequenced by Viscerality)

E2M4: Air Filtration Plant
Author: WeirdSandiwch
MIDI: Clandestine by Psyrus

E2M5: Abandoned Tunnels
Author: ViolentBeetle
MIDI: Ghosts in the Walls by stewboy

E2M6: Transport Nexus
Author: Jark
Music: "Archvile on Line 2" by Bucket

E2M7: Research Complex
Author: Cannonball
MIDI: Gutter Penny by  Augustus E. Knezevich

E2M8: Ceres Gateway
Author: Nefelibeta
MIDI: Chex Quest 3 E2M5

E2M9: Artifact Storage
Author: Hitboi 
MIDI: Beatdown by Joshua "Dragonfly" O'Sullivan (from Overcome album)

E3M1: Lunar Gateway
Author: LordEntr0py
MIDI: Technoprisoners by Jimmy

E3M2: Tranquility Terminal
Author: RHhe82
MIDI: Hate Machine" by Jimmy (James Paddock)

E3M3: Deep Space Observatory
Author: dac
MIDI: Long Night by stewboy

E3M4: Fusion Plant
Author: BluePineapple72 
MIDI: Well of Ass by Jimmy

E3M5: Helium Refinery
Author: Captain Toenail
MIDI: Dark Halls remix by Jay Reichard

E3M6: Deep Crust Borehole
Author: myolden
MIDI: Stage 1 from Cybernator

E3M7: Freight Terminal
Author: MemeMind
MIDI: Freighthoppers by Jimmy

E3M8: Space Elevator
Author: muumi
Music: Escaping the Mechanism by Jimmy

E3M9: The Dark Side
Authors: Astro X and ViolentBeetle
MIDI: Thermite by Jimmy

E4M1: Docking Station
Author: LordEntr0py 
Escaping the Doomed Forgress by Myrgharok

E4M2: Customs Office
Author: Anarkzie 
MIDI: Mars Processing Station from Descent

E4M3: Commercial District
Author: RataUnderground
MIDI: Devil's Ground by Mark Klem

E4M4: Residential Areas
Author: DJV
MIDI: Archaic Doctrine by TrialD

E4M5: Waste Recycling Facility
Author: MAN_WITH_GUN 
MIDI: "Under Death" by Mark Klem

E4M6: Mass Propulsion
Author: SMG_Man
"Cry of Desperation" by Tristan Clark (Eris Falling)

E4M7: The Tether
Author: Engired
MIDI: Legion of the Lost from TNT

E4M8: Impact Site
Author: PinkFlamingo 
MIDI: Moaning Souls

E4M9: Cult Headquarters
Author: Mystic 256
MIDI: Junkie Smack by Mark A. Klem

Intermission music: Suspence Reprise by Rich Nigel
Text Screen Music: Eclectic Death by Peccatum Mihzamiz
Title Music: Crystalline by Psyrus

Title Picture: muumi
M_DOOM: BluePineapple72 
Skies are based of Mek's Box 'o skies
Intermission screens by ViolentBeetle with help of PinkFlamingo

Additional textures borrowed from cc4 (Water and lava falls) and Syringe (Moon rock, likely originally from Duke Nukem 3D). 