Question: Gummo is the soundtrack album to the film of the same name, and contains songs that were recorded specifically for the film, or were featured in the film, the soundtrack is most notably an abridged version of Burzum, a music project that began in what year, by the Norwegian musician and writer Varg Vikernes?

Context paragraphs:
Dauði Baldrs: Dauði Baldrs (English: "Baldr's Death" or "The Death of Baldr") is the fifth album by the Norwegian one-man band Burzum.  Unlike Burzum's previous work, which was mostly black metal, this is a dark ambient album.  It was recorded using a synthesizer and a normal tape recorder by Varg Vikernes while he was in prison, as he was not allowed to have any other instruments or recording equipment.  It was completed in a few months due to his limited access to synthesizers, which was also the case with the following album, "Hliðskjálf".

Gummo (soundtrack): Gummo is the soundtrack album to the film of the same name and contains songs that were recorded specifically for the film or were featured in the film.  The album is mostly made up of various forms of metal, ranging from black metal to powerviolence to grindcore and sludge metal.  The soundtrack also includes a few eccentric selections of music which include industrial metal, power electronics, drum and bass, bluegrass, classical and folk selections, most notably an abridged version of Burzum's ambient piece "Rundgang um die Transzendentale Säule der Singularität".

Filosofem: Filosofem (Norwegian for "philosopheme") is the fourth studio album by Norwegian black metal solo project Burzum.  It was recorded in March 1993 and was the last recording before Varg Vikernes' imprisonment (16 May 1994); the album was not released until January 1996, however.  A music video was made for the song "Dunkelheit", which received airtime on both MTV and VH1.

Umskiptar: Umskiptar (Old Norse for "Metamorphosis") is the ninth studio album by the Norwegian one-man band Burzum, released on 21 May 2012 through Byelobog Productions.  It has been described by Varg Vikernes as a "return to the roots", with a priority on atmosphere.  The album's lyrics are taken from an Old Norse poem entitled "Völuspá".  The album was leaked two months before its release date, due, according to Vikernes, to a former PR agent of his having "sent promotional copies of the entire album to left wing extremist magazines" without his knowledge or consent.

Hliðskjálf (album): Hliðskjálf is the sixth album by Norwegian one-man band Burzum.  This album was the second to be recorded by Varg Vikernes while he was imprisoned for murder and arson and also Burzum's second ambient album. " Dauði Baldrs" and "Hliðskjálf" were created with synthesized instruments as he was not allowed any other instruments while being imprisoned.  The first pressing of its vinyl format release was pressed on a shiny burnished color reminiscent of gold, instead of the standard black color vinyl record.

The Ways of Yore: The Ways of Yore is the eleventh studio album by Norwegian musical project Burzum, released on 2 June 2014 by sole member Varg Vikernes' label Byelobog Productions.  The album retains the ambient and medieval music sound Vikernes started with Burzum's previous album, "Sôl austan, Mâni vestan", albeit introducing vocals.

Varg Vikernes: Varg Vikernes (] ; born Kristian Larsson Vikernes, 11 February 1973; legally Louis Cachet) is a Norwegian musician and writer.  In 1991, he founded the one-man music project Burzum, which is considered one of the most influential black metal acts.  Three years later, he was convicted of murder and arson, and subsequently served over 14 years in prison.

The Older Ones: The Older Ones is the first compilation album by Norwegian blackened death metal band Old Funeral, which was made up by key players in the Norwegian black metal scene, including bassist/vocalist Olve "Abbath" Eikemo (Immortal), guitarist Harald "Demonaz" Nævdal (Immortal) and guitarist Kristian "Varg" Vikernes (Burzum).  By the time this album was released, the members had already gone their separate ways, with Immortal a going concern for Abbath and Varg in jail.

Burzum: Burzum ( ; ] ) is a music project that began in 1991 by the Norwegian musician and writer Varg Vikernes.  It became a part of the early Norwegian black metal scene and is considered to be one of the most influential acts in black metal.

Mayhem (band): Mayhem is a Norwegian black metal band formed in 1984 in Oslo.  They were one of the founders of the Norwegian black metal scene and their music has strongly influenced the black metal genre.  Mayhem's early career was highly controversial, primarily due to their notorious live performances, the 1991 suicide of vocalist Per Yngve Ohlin ("Dead") and the 1993 murder of guitarist Øystein Aarseth ("Euronymous") by former member Varg Vikernes ("Count Grishnackh"), of Burzum.

Supporting paragraphs: Gummo (soundtrack) Burzum
Answer: 1991