Doom music

All of Doom's music was composed by Robert Prince. The fourth episode added in The Ultimate Doom did not include any new tracks and only used songs from the first three episodes.

Many of the songs were inspired by or closely mirror popular rock and metal songs of that era, from groups such as Alice in Chains, Metallica, Pantera and Slayer.

3. Correct me if I am wrong but I do think "sinister" was inspired by "sandy's metamorphosis", the track made for the      movie "Inseminoid - aka horror planet" from 1981, check here https://www.youtube.com/watch?v=bVgzZqj1Rdo  sounds very similar in my opinion. Or the other track from the same movie "death in space"
 * 1) Exactly which song "At Doom's Gate" is based on has been disputed, because this style of riff was hugely popular in 1980s heavy metal. It is mostly agreed that the chorus riff of Metallica's "No Remorse" was the song Prince was trying to emulate. However the riff, almost verbatim, is also featured in D.R.I.'s "Hooked" from their 1987 LP Crossover, while Metallica's "Master of Puppets" has a similar riff and is also suggested. A similar sequence is heard in "The Family Ghost" by King Diamond (the approximately 2:05 into the song). Slayer's "Behind The Crooked Cross" at 1:08, Blackmayne's "Twilight Of Lear" from their 1985 LP Blackmayne, and Aria's "Это Pок" (English: "This Is Doom" or "This Is Fate") from their 1985 debut album Мания Величия (English: Megalomania) are also possible, as well as Bathory's Sadist.
 * 2) The Doom IWAD file includes two title screen MIDI lumps, d_intro and d_introa.  The latter is used when using OPL MIDI playback (ie. on an Adlib or Soundblaster card).