Musical inspirations behind Doom's music

Much of Doom's soundtrack is inspired by early '90s heavy metal music, and fans have long noted similarities between tracks from Doom's soundtrack and popular heavy metal songs. A well-known page on Doomworld titled Bobby Prince is a Filthy Thief details some of the more obvious similarities.

In 2007, some of Doom's unused music tracks were released by John Romero, and metadata comments in these files name the tracks that inspired them. It can be assumed that in composing Doom's music, Bobby Prince had a small collection of heavy metal CDs that were being used as inspiration for covers. Using available data it's possible to build up a map of what was likely to have been in that collection.

Definites
Alice In Chains - Dirt
 * Released September 1992. Referenced in MIDI metadata.
 * Most tracks weren't used but "Them Bones" was used for Doom II MAP23.

Alice In Chains - Facelift
 * Released August 1990. Referenced in MIDI metadata.
 * None of the tracks were used in Doom.

Slayer - South Of Heaven - Released July 1988. Referenced in MIDI metadata. - "Behind The Crooked Cross" was used for Doom E3M3.

Soundgarden - Badmotorfinger - Released October 1991. Tracks referenced in MIDI metadata, though the album name is not. The first two tracks were turned into MIDI files, but neither were used.

Stone Temple Pilots - Core - Released September 1992. Tracks referenced in MIDI metadata, though the album name is not. The first two tracks were turned into MIDI files. - "Sex Type Thing" inspired Doom II MAP09.

Pantera - Vulgar Display of Power - Released February 1992. Not referenced in metadata, though multiple Doom music tracks are inspired by tracks off this album: - "Rise" inspired Doom E1M4. - "Mouth for War" inspired Doom E3M1. - "This Love" inspired Doom 2 MAP18/MAP26.

Speculative
AC/DC - Big Gun (single) or Last Action Hero soundtrack - "Big Gun" is referenced in metadata; the single was released June 1993. - Used as inspiration for Doom E2M1. - Romero might have had the single, but it's equally plausible that he  had the Last Action Hero soundtrack, which was mostly heavy metal bands that fit with the rest of the collection here.

Black Sabbath - Dehumanizer - Released June 1992. Not referenced in metadata. - "After all (the dead)" clearly inspired the music for Doom 2 MAP10 / MAP16.