Question: What is the name of this heavy metal band from Copenhagen, formed in 1981, who were part of the album A Tribute to Judas Priest: Legends of Metal?

full_context: Document 1: A Tribute to Judas Priest: Legends of Metal: A Tribute to Judas Priest: Legends of Metal Vol. I and A Tribute to Judas Priest: Legends of Metal Vol. II are tribute albums, both released in 1997 by Century Media Records. It includes several rock and metal bands such as Helloween, Overkill, Saxon, Heavens Gate, Blind Guardian, Mercyful Fate, and Iced Earth, covering songs by British heavy metal band Judas Priest. Some of the songs included in this album have been previously released by the artists.
Document 2: Holy Dio: Tribute to Ronnie James Dio: Holy Dio: A Tribute to Ronnie James Dio is a compilation album, released on January 25, 2000. It is a tribute album to Ronnie James Dio, featuring covers of several songs he had sung during his time with Rainbow, Black Sabbath and his own band Dio. The covers done on this tribute album were recorded by mostly power metal bands.
Document 3: King Diamond: Kim Bendix Petersen (born 14 June 1956), better known by his stage name King Diamond, is a Danish heavy metal musician. As a vocalist, he is known for his extensive vocal range, in particular his usage of falsetto. He is the lead vocalist for both Mercyful Fate and the eponymous King Diamond.
Document 4: Angel of Retribution: Angel of Retribution is the fifteenth studio album by British heavy metal band Judas Priest, released in 2005. It is the band's first album since "Painkiller" (1990) to feature Rob Halford. The album debuted at #13 on the US "Billboard" chart, which made it the third highest chart of a Judas Priest album (the second being "Nostradamus" and the highest being "Redeemer of Souls"). The album was produced by Roy Z, who co-wrote the song "Deal with the Devil".
Document 5: Hell Bent Forever: A Tribute to Judas Priest: Hell Bent Forever: A Tribute to Judas Priest is a tribute album, released in 2008. It includes several rock and metal bands such as Motörhead, Icarus Witch, L.A. Guns and Sepultura, covering songs by British heavy metal band Judas Priest. The album's font is a mistake because the red lettering is in the style of Iron Maiden's logo instead of Judas Priest's logo
Document 6: Mercyful Fate discography: The discography of Mercyful Fate, a Danish heavy metal band, consists of seven studio releases, three compilations, three singles, and six music videos. Mercyful Fate was formed in 1981 by vocalist King Diamond and guitarist Hank Shermann. After several line-up changes and self-made demos, Mercyful Fate released their self-titled EP in 1982, with the line-up of King Diamond (vocals), Hank Shermann (guitar), Michael Denner (guitar), Timi Hansen (bass) and Kim Ruzz (drums). With this line-up, the group released their debut album, "Melissa", on October 30, 1983, through Roadrunner Records. The following year, Mercyful Fate recorded their second album "Don't Break the Oath". Released on September 7, 1984, the album debuted at number 33 on the Swedish Sverigetopplistan charts. Despite winning a cult following around the world, Mercyful Fate broke up in April 1985, due to musical differences.
Document 7: King Diamond discography: The discography of King Diamond, a Danish heavy metal band, consists of twelve studio releases, two live albums, five compilations, six singles, and four music videos. King Diamond was formed in 1985, after the dissolution of the group Mercyful Fate, by vocalist King Diamond, guitarists Andy LaRocque and Michael Denner, bassist Timi Hansen, and drummer Mikkey Dee. The following year, the band released their debut album "Fatal Portrait", which charted at number 33 in Sweden. King Diamond's second studio album, "Abigail", was released on February 24, 1987, and reached number 123 in the US, number 39 in Sweden and number 68 in the Netherlands. Following some line-up changes, the group released the album ""Them"" in 1988, which peaked at number 38 in Sweden, number 65 in the Netherlands, and at number 89 in the US, making ""Them"" King Diamond's highest charting album in North America. The following year, the band released the follow-up album "Conspiracy", which charted at number 111 in North America, number 41 in Sweden and at number 64 in the Netherlands. In 1990, after more line-up changes, King Diamond released the album "The Eye", which only charted at number 179 in the US, which makes "The Eye" King Diamond's lowest charting album in North America.
Document 8: Black Rose (Danish band): Black Rose was a Danish hard rock / heavy metal band with King Diamond on vocals. The band was started in 1979, largely inspired by bands such as Judas Priest, Deep Purple and Golden Earring. King Diamond already had a very theatrical stage act, for which he later got fame in Mercyful Fate. The band broke up in 1981 as King Diamond joined punk metal band Brats in November 1980.
Document 9: Metal Works '73–'93: Metal Works is a compilation album by Judas Priest, released in 1993. A remastered edition was released in 2001, with the same track listing. All material was previously available. All albums to that date are represented with the exception of their debut, "Rocka Rolla", although a live version of "Victim of Changes" (from "Unleashed in the East", with what appears to be an American sounding audience dubbed on at the end, instead of the familiar Japanese one from the album version) is used rather than the studio version on "Sad Wings of Destiny". This is because the band no longer owns the rights to their first two albums.
Document 10: The Best of Judas Priest: The Best of Judas Priest is a collection of a few select songs from Judas Priest's first two albums, and was released under Gull, the band's former record label. It was the first of many reissues of the band's earlier material produced in an effort to "capitalize on Judas Priest's popularity" and was released without any consent from the band.
Document 11: Darkthrone: Darkthrone is a Norwegian heavy metal band. It formed in 1986 as a death metal band under the name Black Death. In 1991, the band embraced a black metal style influenced by Bathory and Celtic Frost and became one of the leading bands in the Norwegian black metal scene. Their first three black metal albums—"A Blaze in the Northern Sky", "Under a Funeral Moon" and "Transilvanian Hunger" (sometimes dubbed the "Unholy Trinity") — are considered the peak of the band's career and to be among the most influential albums in the genre. For most of this time, Darkthrone has been a duo of Nocturno Culto and Fenriz, who have sought to remain outside the music mainstream. Since 2006, their work has strayed from the traditional black metal style and incorporated more elements of traditional heavy metal, speed metal and punk rock, being likened to Motörhead.
Document 12: Judas Rising: "Judas Rising" is a song by heavy metal band Judas Priest. It is the opening track on the band's 2005 album Angel of Retribution. The song is about the Judas Priest "Messiah" on the cover of the albums "Sad Wings of Destiny", "Painkiller" and "Angel of Retribution". . It was also included on the album's The Essential Judas Priest and
Document 13: Mercyful Fate: Mercyful Fate is a Danish heavy metal band from Copenhagen, formed in 1981 by vocalist King Diamond and guitarist Hank Shermann. Influenced by progressive rock and hard rock, with lyrics dealing with Satan and the occult, Mercyful Fate were part of the first wave of black metal in the early to mid-1980s. Many of the bands from this movement went on to influence later black metal musicians in the 1990s, particularly in Norway. Since the band's inception in 1981, Mercyful Fate have released seven studio albums, two extended plays and four compilations.
Document 14: King Diamond (band): King Diamond is a Danish heavy metal band formed in 1985 by vocalist King Diamond, guitarists Andy LaRocque and Michael Denner, bassist Timi Hansen and drummer Mikkey Dee. Diamond, Denner and Hansen had recently departed the group Mercyful Fate, and decided to form a new band under the King Diamond moniker, as it was already known from the Mercyful Fate days. In 1986, King Diamond released their debut album "Fatal Portrait". Since then the band have released a total of twelve studio albums (most of them concept albums), two live albums, two extended plays, five compilations and five singles.
Document 15: De Mysteriis Dom Sathanas: De Mysteriis Dom Sathanas is the first full-length studio album by the Norwegian black metal band Mayhem. Songwriting began in 1987, but due to the suicide of vocalist Per "Dead" Ohlin and the murder of guitarist Øystein "Euronymous" Aarseth, the album's release was delayed until May 1994. "De Mysteriis Dom Sathanas" is widely considered one of the most influential black metal albums of all time.
ground_truth: Mercyful Fate