Question: From which city in Norway hails the black metal band which played at the Bloodstock Open Air heavy metal festival in Walton-on-Trent?
Context: Devilstone Open Air (aka "Velnio Akmuo" in Lithuanian) is a summer open air rock and metal music festival.  It takes place annually since 2009 in the town of Anykščiai, in Lithuania.  Devilstone Open Air has included performers playing black metal, death metal, power metal, thrash metal, sludge metal, doom metal, post rock, stoner rock, and progressive rock music genres.  Music bands from Europe, North and South America, and Australia have performed in the festival.  Devilstone Open Air is usually held in the mid-summer, around the third weekend of July. The Wacken Carnage is a CD/DVD set of death metal band Bloodbath at a very rare live appearance recorded on August 5, 2005, at the Wacken Open Air Festival in Germany.  At that time, this live appearance was presented as the only Bloodbath show there would ever be, but Bloodbath has since headlined Party.San Metal Open Air in Germany on August 8, 2008, Pellavarock in Finland on August 9, 2008, Hellfest in France on June 22, 2010, and Bloodstock Open Air in England on August 15, 2010. Immortal is a black metal band from Bergen, Norway, founded in 1991 by frontman and bassist Abbath Doom Occulta (Olve Eikemo) and guitarist Demonaz Doom Occulta (Harald Nævdal).  The pair worked with various drummers (including Grim, Armagedda and Hellhammer), and were later joined by current drummer Horgh (Reidar Horghagen) in 1996. Bloodbath is a Swedish death metal supergroup from Stockholm, formed in 1998.  The band has released four full-length albums, two EPs and two DVDs depicting their performances at Wacken Open Air (in 2005) and Bloodstock Open Air (in 2010).  The group comprises Martin Axenrot (Opeth), Anders Nyström (Katatonia), Jonas Renkse (Katatonia), Nick Holmes (Paradise Lost), and Per Eriksson, who was previously the guitar technician for both Bloodbath and Katatonia. Bloodbath over Bloodstock is a live DVD by Swedish death metal band Bloodbath.  It features the entire live set the band played at Bloodstock Open Air in August 2010.  It was filmed by the production company The Dark Box.  It was released on April 25, 2011, by Peaceville Records.  This is the final release with Mikael Åkerfeldt in the band as he quit in 2012. Bangalore Open Air (BOA) is India's only dedicated heavy metal open air music festival which takes place yearly in Bangalore, India.  Bangalore Open Air, in collaboration with Wacken Open Air (currently considered as the biggest heavy metal festival in the world) is into its 6th edition as of 2017.  The festival also hosts Wacken Metal Battle's Indian leg, with the winning band getting an opportunity to play at Wacken Open Air.  India is the 27th Country to participate in the W:O:A Metal Battle which has been organised in the country since 2011. Hell & Heaven Metal Fest (H&H, el Hell, or Festival Hell and Heaven) is an open air heavy metal music festival.  It takes place annually during Fall or Spring, near Mexico City in Texcoco, located in the State of Mexico, in the central part of the country.  With over 30,000 festival visitors, it attracts metal music fans of all subgenres including thrash metal, black metal, death metal, power metal, gothic metal, folk metal, and even metalcore, nu metal, hard rock from all over the world.  The festival is mostly attended by a Mexican audience from all around the country, but attracts a large number of visitors from Central and South America, as well as fans from Europe and other parts of the world. Cloudscape is a melodic metal band from Helsingborg, Sweden.  They have performed live at festivals such as ProgPower Europe, Sweden Rock Festival, ProgPower UK, and Bloodstock Open Air and in 2014 they did a 3½ week long European Tour.  s of 2015 , Cloudscape have released four full-length albums, six music videos and a limited "Best Of" album (2014). Paul Raymond Gregory is an English artist born in Derby (UK) in 1949.  Best known for his J. R. R. Tolkien-inspired fantasy paintings and rock album covers, he has also created book covers and is a co-founder of Bloodstock Open Air Heavy Metal Festival. Bloodstock Open Air is an English heavy metal festival held annually at Catton Hall in Walton-on-Trent, Derbyshire, since 2005.  Bands that have played at the festival over the years include Twisted Sister, Saxon, Mastodon, Gojira, Behemoth, Slayer, Anthrax, Cannibal Corpse, Venom, Trivium, Rob Zombie, Emperor, Alice Cooper, Motorhead, Kreator, Blind Guardian, Amon Amarth, Megadeth, Testament, Exodus, Immortal, Morbid Angel, Machine Head, Lamb of God, and hundreds of others.  Originally on one stage only, the festival expanded to incorporate a second stage in 2006.  Known simply as The Unsigned Stage, it was designed to provide a platform for the next generation of metal talent to reach a wider audience.  In 2010 it was renamed The New Blood Stage.
Answer: Bergen