Question: Where did the band which sings Run to the Hills form?

full_context: Document 1: British Lion (album): British Lion is the debut solo album from Steve Harris, best known as the bassist and primary songwriter for the British heavy metal band Iron Maiden. The album was announced on 18 July 2012 and released on 24 September.
Document 2: Flight of Icarus: "Flight of Icarus" is a song by the English heavy metal band Iron Maiden. It was released as their eighth single and the first from their fourth studio album, "Piece of Mind" (1983). It was the band's first single to be released in the United States, becoming one of their few songs to gain substantial airplay, peaking at No. 8 on the "Billboard" Top Album Tracks chart - the highest position of any Iron Maiden single in the US. It was also a success in the UK, peaking at No. 11 on the UK Singles Chart. It is also the band's first release to feature Nicko McBrain, who replaced Clive Burr on drums in 1982.
Document 3: Classic Albums: Iron Maiden – The Number of the Beast: Classic Albums: Iron Maiden -- The Number of the Beast is a documentary about the making of the album of the same name by the British heavy metal band Iron Maiden, released on 26 November 2001 as part of the Classic Albums documentary series. Directed by Tim Kirkby, it featured cuts from the title track, ``Children of the Damned '',`` Run to the Hills'', and ``The Prisoner, ''in addition to extended interviews and live footage of`` Hallowed Be Thy Name'', recorded during the band's performance at the Rock in Rio festival in 2001.
Document 4: Run to the Hills: "Run to the Hills" is a song by the English heavy metal band Iron Maiden. It was released as their sixth single and the first from the band's third studio album, "The Number of the Beast" (1982). Credited solely to the band's bassist, Steve Harris, although significant contributions were made by lead vocalist Bruce Dickinson, it remains one of their most popular songs, with VH1 ranking it No. 27 on their list of the 40 Greatest Metal Songs and No. 14 on their list of the Greatest Hard Rock Songs.
Document 5: Run to the Hills: ``Run to the Hills ''is a song by the English heavy metal band Iron Maiden. It was released as their sixth single and the first from the band's third studio album, The Number of the Beast (1982). Credited solely to the band's bassist, Steve Harris, although significant contributions were made by lead vocalist Bruce Dickinson, it remains one of their most popular songs, with VH1 ranking it No. 27 on their list of the 40 Greatest Metal Songs and No. 14 on their list of the Greatest Hard Rock Songs.
Document 6: List of Iron Maiden concert tours: Iron Maiden are a British heavy metal band, founded in 1975 by bassist Steve Harris in London, England. After several personnel changes in the 1970s, the band settled on a lineup of Harris, Paul Di'Anno (lead vocals), Dave Murray (lead and rhythm guitars), Dennis Stratton (backing vocals, lead and rhythm guitar) and Clive Burr (drums), before they set out on their first professional tour, the Metal for Muthas Tour which supported the compilation album of the same name. After taking on a supporting slot with Judas Priest on their British Steel Tour and setting out on their own headline tour in support of their debut album, "Iron Maiden", the band supported Kiss on the European leg of their Unmasked Tour, following which Stratton was dismissed because of musical differences. Guitarist Adrian Smith was hired, following which Iron Maiden set out on a short series of UK dates before recording their second studio album, "Killers".
Document 7: The Final Frontier: The Final Frontier is the fifteenth studio album by British heavy metal band Iron Maiden. It was released on 13 August 2010 in Germany, Austria and Finland, 17 August in North America, 18 August in Japan, and 16 August worldwide. At 76 minutes and 34 seconds, it is the band's second-longest studio album to date, a duration surpassed only by 2015's "The Book of Souls".
Document 8: Edward the Great: Edward the Great: The Greatest Hits is Iron Maiden's third "best-of album", originally released on 4 November 2002. In contrast to other works by the group collecting together songs from different albums, such as "Best of the Beast", "Edward the Great" includes no tracks with performances with vocalist Paul Di'Anno; however, material from when Blaze Bayley fronted the band were included.
Document 9: The Number of the Beast (song): ``The Number of the Beast ''is a song by the English heavy metal band Iron Maiden. It is Iron Maiden's seventh single release, and the second single from their 1982 studio album of the same name. It was reissued in 2005 and also prior to that in 1990 in The First Ten Years box set on CD and 12'' vinyl, in which it was combined the previous single,`` Run to the Hills ''.
Document 10: Running Free: "Running Free" is the debut single by Iron Maiden, released on 8 February 1980 on the 7" 45 rpm vinyl record format. It was written by Steve Harris and Paul Di'Anno. The song appears as the third track on the band's debut album "Iron Maiden" (and the fourth track on its 1998 re-release). In 1985, a live version of the song was released as the first single from "Live After Death" (the band's twelfth single). In 1990, the original single was reissued on CD and 12" vinyl as part of "The First Ten Years" box, in which it was combined with the band's next single, "Sanctuary". The 1985 live single was also released as part of this box set, combined with 1985's "Run to the Hills".
Document 11: Iron Maiden: Iron Maiden are an English heavy metal band formed in Leyton, East London, in 1975 by bassist and primary songwriter Steve Harris. The band's discography has grown to thirty-nine albums, including sixteen studio albums, twelve live albums, four EPs, and seven compilations.
Document 12: Beast over Hammersmith: Beast over Hammersmith is a live album by the British heavy metal band Iron Maiden, released on 4 November 2002. Recorded 20 years previously, during The Beast On The Road tour at the Hammersmith Odeon, the footage was specially co-produced and mixed by Steve Harris and Doug Hall to be a part of the Eddie's Archive box set. Even though this album contains material from "The Number of the Beast", it was actually recorded two days prior to its release (although "Run to the Hills" had already been released as a single).
Document 13: The Number of the Beast (song): "The Number of the Beast" is a song by the English heavy metal band Iron Maiden. It is Iron Maiden's seventh single release, and the second single from their 1982 studio album of the same name. It was reissued in 2005 and also prior to that in 1990 in "The First Ten Years" box set on CD and 12" vinyl, in which it was combined with the previous single, "Run to the Hills".
Document 14: Iron Maiden (album): Iron Maiden Studio album by Iron Maiden Released 14 April 1980 Recorded January 1980 Studio Kingsway Studios, London, England Genre Heavy metal Length 37: 35 Label EMI Harvest / Capitol (North America) Producer Wil Malone Iron Maiden studio albums chronology Iron Maiden (1980) Killers (1981) Killers 1981 1998 remastered version cover Singles from Iron Maiden ``Running Free ''Released: 8 February 1980`` Sanctuary *'' Released: 23 May 1980 * Not an original album track, but added to later editions
Document 15: Fear of the Dark (Iron Maiden album): Fear of the Dark is the ninth studio album released by English heavy metal band Iron Maiden. Released on 11 May 1992, it was their third studio release to top the UK albums chart and the last to feature Bruce Dickinson as the group's lead vocalist until his return in 1999.
ground_truth: Leyton
sub_queries: who sings the song run to the hills Answer: Iron Maiden
Iron Maiden >> location of formation Answer: Leyton