Question: Where was the band that performed Piece of Mind formed?

full_context: Document 1: 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 2: 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 3: 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 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: 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 6: 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 7: 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 8: Maiden Japan: Maiden Japan, also known as "Heavy Metal Army", is a live EP by the British heavy metal band Iron Maiden. The title is a pun of Deep Purple's live album "Made in Japan".
Document 9: Rust in Peace: Rust in Peace is the fourth studio album by American thrash metal band Megadeth, released on September 24, 1990 by Capitol Records. Following the departure of band members Jeff Young and Chuck Behler in 1989, "Rust in Peace" was the first album to feature guitarist Marty Friedman and drummer Nick Menza. "Rust in Peace" received universal acclaim from fans and critics, and was responsible for bringing Megadeth to the attention of a mainstream metal audience. It has been cited as one of the best thrash metal records of all time by publications such as "Decibel" and "Kerrang!", and listed as one of the "1001 Albums You Must Hear Before You Die". The album was nominated for a Grammy Award for Best Metal Performance at the 33rd Grammy Awards. At the 1991 Foundations Forum, it won a Concrete Foundations Award for Top Radio Album and the singleHangar 18 won Top Radio Cut.
Document 10: Brave New World (Iron Maiden album): Brave New World is the twelfth studio album by English heavy metal band Iron Maiden, released on 29 May 2000. It was their first studio release since the return of longtime lead singer Bruce Dickinson (who left in 1993) and guitarist Adrian Smith (who left in 1990) in 1999, as well as the band's first studio recording as a six-piece, as Janick Gers, who replaced Smith in 1990, remained with the band.
Document 11: 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.
Document 12: 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 13: 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 14: Piece of Mind: Piece of Mind is the fourth studio album by the English heavy metal band Iron Maiden, originally released in 1983 by EMI and then by Capitol in Canada and the US, where it was later reissued by Sanctuary/Columbia Records. It was the first album to feature drummer Nicko McBrain, who had recently left the Paris-based band Trust and has been Iron Maiden's drummer ever since.
Document 15: 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.
ground_truth: Leyton
sub_queries: Piece of Mind >> performer Answer: Iron Maiden
Iron Maiden >> location of formation Answer: Leyton