Fully vanilla compatible

Modules are basically MIDIs, but with their own samples bundled in, meaning they are often less than a megabyte in size and don't bloat your wad's file size.
They have been used for games such as Unreal, Deus Ex, and Jazz Jackrabbit, and can easily fit into Doom.
They only work in DSDA-Doom, ZDoom source ports, and Edge-classic however, so if you're looking to make maps for vanilla, Crispy, or some obscure port, the music will not work.

There is a useful site called The Mod Archive with its huge library, and a handy online music player for instant listening.

Don't know where to start? Here are some suggestions:

Scroll down in the home page to see the newest modules, favorited modules and some randomized picks.

Not satisfied with the results? Here are some personal recommendations :
Marcin Gackowski | Elwood | Dr. Awesome | Xaser | Robyn | Lizardking | Jogeir Liljedahl | zabutom

Welcome to the first installment of DUI, the theme of this one is to make Hellish Tech Bases in the style of Romero's maps from E1 of Doom.

Slots (anyone can claim) :
E2M1 - Reserved after all maps are finished
M2 - Open
M3 - Open
M4 - Open
M5 (secret exit) - Open
M6 - Flooded Foundry - joe-ilya
M7 - Open
M8 (boss map) - Open
M9 (secret map) - Open

Rules :

• Wad names must be named like this : dui1_username_slot.wad
• Vanilla compatible.
• No BFG.
• No cyberdemons (Except for M8), nor Spider masterminds.
• 199 monsters max.
• Must use white/gray rock as outdoor terrain.
• New music is allowed.
• Must have difficulty settings.
• Must have co-op and deathmatch player starts added and compatible with.
• No new textures, nor flats, nor sprites allowed.
• No usage of fast actions such as fast lifts, fast doors, etc. as these were unavailable in Doom 1 until Episode 4.
• No vanilla tricks such as instant raising/lowering floors/ceilings, self-referencing sectors.
• Deadline will be decided and announced later.
• E2M8 must have a normal map section before the boss arena, similar to Romero's E1M8b.

Here's some ways you can imitate Romero's style :

• Outdoor areas are reserved for secrets and vistas only
• Horseshoe layout
  Put important things and/or new places that can be seen ahead of time, but can't be instantly accessed, and require some walkaround.
• Symmetrical rooms
  Don't overdo.
• Secrets that act as shortcuts around the map

Here's some ways you can incorporate some hellishness into your map, using (but not restricted to) these Romero-isms :

• Cracks in the floor/ceiling
• Red stars that act as teleporters

Here are John Romero's level design rules :

-always changing floor height when I wanted to change floor textures
-using special border textures between different wall segments and doorways
-being strict about texture alignment
-conscious use of contrast everywhere in a level between light and dark areas, cramped and open areas
-making sure that if a player could see outside that they should be able to somehow get there
-being strict about designing several secret areas on every level
-making my levels flow so the player will revisit areas several times so they will better understand the 3D space of the level
-creating easily recognizable landmarks in several places for easier navigation

These are just what I could find in E1M3 alone, there are plenty more.

No support texture between the brown and grey textures in the secret exit room secret.

No support texture between the computer texture and the hexagons.

Misalignment at the raising stairs room, the other side has one too.

Misalignment at the doorway, the other side has one too.

Above the computer panels is a misalignment in the yellow key room, the other secret has one too.

Misalignment in the central pool room, the other side has one too.

An inaccessible outside area with some ammo behind the yellow door.

For Ultimate Doom :

-_ |GAME SCREENS| _-

Title Screen: - D_INTRO
Level End Screen (Intermission): - D_INTER
Text Screen (Endgame): - D_VICTOR
E3 End Cutscene: - D_BUNNY

-_ |MAPS| _-

EXMX for the first three episodes, replace the Xs with the number of episode and map for the slot your map's on.

Episode 4 reuses the previous tracks :

E4M1: - D_E3M4
E4M2: - D_E3M2
E4M3: - D_E3M3
E4M4: - D_E1M5
E4M5: - D_E2M7
E4M6: - D_E2M4
E4M7: - D_E2M6
E4M8: - D_E2M5
(Secret map) E4M9: - D_E1M9

Download : https://www.doomworld.com/idgames/levels/doom2/Ports/megawads/rottriangle

A Boom-compatible megawad of ~20 maps for Doom 2, using only 100 linedefs, with Dehacked to add extra decorations to compensate.

More info and story is in the text file.

Finally had time to touch this map; here is the first room of the library.

banquetofflamesFDAjoe.lmp FDA for @Cuppykeks map.
The book in front of the exit switch has a massive HOM, despite me using the newest resource pack.

Streaming this : https://www.twitch.tv/joe_ilya

Surfing

They pick up health/ammo/armor even when they have 99% of it.

They actively pick invisibility spheres.

They play at max gamma.

They use BFG on single zombiemen.

They use non-berserk fist.

They play with Brutal Doom.

They play with sound and music off.

They use non-berserk fist on cybers.

They stare at each swastika in the secret maps for an hour.

Their favorite map is The Chasm.

They play with keyboard only.

They beat Mephisto's Masoleum and The Express Elevator To Hell legit.

They use the tiny window frame of invulnerability that IDCHOPPERS provides to avoid damage.

They waited 3 years for berserk to wear off.

They play on Nightmare!

They use mouselook.

I thought you hated HDoom

Mine are :

• Finish Lazarevenant, and 6 Doomsdays.
• Make a final version for DBPs 40, 42, 43, 44 (the ones I led past #36) and publish them to IDGames.
• Make a new mapping series for this forum, similar to DBPs.
• Make some good midis.
• Make my first ever Heretic map for Cuppy's community project.

Title : Sandcastle
MIDI : Beach Bunny from Jazz Jackrabbit 2 (none of the midis in the pack fit the beach theme)
ae_joe-ilya_v1.wad

Rise of the Triangles is now on IDGames : https://www.doomworld.com/idgames/levels/doom2/Ports/megawads/rottriangle

MAP01-05 https://www.youtube.com/watch?v=nQyjhC68Dk4
06 https://www.youtube.com/watch?v=OZwY6bLw3as
07 https://www.youtube.com/watch?v=HeRr6bQoRns
https://www.youtube.com/watch?v=lTXdeNqyTWs

@Walter-c Yes, I'm planning to make more DUIs, they're going to have different map formats, and different deadlines, depending on the theme of the incident.

32-35 https://www.youtube.com/watch?v=L434m6AgkUY
16-17 https://www.youtube.com/watch?v=ZCll_lA33qs
18 https://www.youtube.com/watch?v=eq_SYbw8Z40
19-20 https://www.youtube.com/watch?v=YDVWq-W4OOI
21 https://www.youtube.com/watch?v=q2lUSeP4tC4
22 https://www.youtube.com/watch?v=FDuFc5I8spc
23 https://www.youtube.com/watch?v=E9lpknQ6jsY
24 https://www.youtube.com/watch?v=X4KENA2Gmp4
25-26 https://www.youtube.com/watch?v=XNgPYq7kSDk
27-28 https://www.youtube.com/watch?v=boH2BSsTZTY
29 https://www.youtube.com/watch?v=Sb2A2_c50ik
https://www.youtube.com/watch?v=N0wl4KS4ywM

I haven't touched my map for the entirety of December.

Strife midis are underused, come to think of it, I've never heard anyone use them besides DWANGO.