- The inspiration behind E1M1 - At Doom's Gate has historically been a long-standing issue of discussion and contention among Doom's fanbase. Tracks by bands such as Metallica or Pantera have been suggested as sources, but there is no conclusive evidence that supports any particular track. The track itself is based around a generic heavy metal riff, meaning that it sounds similar to many different heavy metal songs. In a 2017 interview, Bobby Prince clarified that it was not inspired by any one song, and was written before having listened to any heavy metal music .
- The inspirations for the tracks noted above are substantiated by metadata comments found in the unreleased MIDI tracks (archived 🏛) released by John Romero, many of which are alternate versions of the MIDI tracks used in Doom. See the article: Musical inspirations behind Doom's music.
- The Doom IWAD file includes two title screen MUS lumps, d_intro and d_introa. The latter is used when using OPL MIDI playback (ie. on an Adlib or Soundblaster card).
"Hiding the Secrets", which is present twice in the IWAD, exists in two slightly different versions:
"Demons on the Prey", which is present thrice in the IWAD, exists in two slightly different versions:
|D_E1M7 and D_E2M5||8591||46d83cbc|
"Intermission from Doom", which is present twice in the IWAD, exists in two slightly different versions:
"Waltz of the Demons", which is present twice in the IWAD, exists in two slightly different versions:
Of all the above Doom songs with different versions, "Waltz of the Demons" is the only one with an audible difference: the bass string instrument that comes in at about 10 seconds in is quieter in D_E2M7 than in D_E3M7. (MIDI channel volumes of 80 and 100, respectively.) The other songs have slightly different MIDI data between versions, but nothing that causes a difference in the way they are played.
- Doomworld.com page about Doom music
- Doom Covers, an article at Doomworld in which samples of Prince's music are compared with his sources
- Doomworld forums , from the
- Doom music synthesized and converted to MP3s