Question: What type of group does Umphrey's McGee and Iron Maiden have in common?
Context: "Virus" is a single from Iron Maiden, released in 1996.  It is the first single since 1980's "Women in Uniform" that does not appear on any official Iron Maiden studio album.  It was, however, featured as a brand new track on the band's first ever career retrospective — 1996's double-disc "Best of the Beast".  It is the only Iron Maiden song to be credited to both of the band's guitarists.  It has never been performed live by Iron Maiden, but Blaze Bayley performed it several times in his solo career.  Lyrically, the song warns of rising business corruption in an increasingly Internet-dependent world. 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". Anton Gustafsson tolkar Iron Maiden (Swedish for "Anton Gustafsson Interprets Iron Maiden") is the first and only album by internet celebrity Anton Maiden.  It was released in 1999.  It consists entirely of MIDI covers of songs by the heavy metal band Iron Maiden, with vocals by Anton. Bruce Dickinson, a British heavy metal singer, has released six studio albums, two live albums, one compilations, ten singles, three video albums, fourteen music videos, and one box set.  In 1979, after playing in local groups, Dickinson joined hard rock band Samson.  He departed after two years to become Iron Maiden's lead vocalist.  His debut with this band is considered a "masterpiece", which was followed with a series of top-ten releases.  In 1989, while Iron Maiden were taking a year off, Dickinson and former Gillan guitarist, Janick Gers, composed a song for .  His solo debut, "Tattooed Millionaire" (1990), was an effort that favoured a hard rock/pop metal approach, different from what fans assumed would be an aggressive, Iron Maiden-like album.  Four songs—the title track, "Dive!  Dive!  Dive! ", "Born in '58", and a cover version of David Bowie's "All the Young Dudes"—were released as singles.  Dickinson returned to Iron Maiden, accompanied by Gers as the new guitarist, and the project went on hiatus. " Dive!  Dive!  Live! " was a live video recorded from a concert in Los Angeles, California, in August 1990, and released in July 1991. The Iron Maidens: World's Only Female Tribute to Iron Maiden is the debut album by American all-female tribute band The Iron Maidens.  The album features selected tracks originally performed by British heavy metal band Iron Maiden.  Michael Kenney, keyboardist for Iron Maiden, appears as a guest musician on the Japanese import version. Iron Maiden is the debut studio album by the English heavy metal band Iron Maiden.  It was issued by EMI on 14 April 1980 in the UK, and a few months later in North America, originally on Harvest/Capitol Records and subsequently Sanctuary Records/Columbia Records in the US.  The North American version also included the song "Sanctuary", previously released in the UK as a non-album single.  In 1998, along with the rest of the band's pre-1995 releases, "Iron Maiden" was remastered with "Sanctuary" added in all territories (but 2015 digital releases and all vinyl reissues use original tracklisting around the globe).  It is the band's only album to feature guitarist Dennis Stratton. Eddie's Head is a box set by Iron Maiden, in the shape of the head of their mascot, Eddie and containing their first 12 albums remastered, from "Iron Maiden" to "Live at Donington", each with bonus multimedia material, plus a limited "In Profile" CD.  The spine of each CD has a part of the original cover art for "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-eight albums, including sixteen studio albums, eleven live albums, four EPs, and seven compilations. Iron Maiden are an English heavy metal band formed by bassist Steve Harris in 1975.  The band's first album, 1980's "Iron Maiden", was written primarily by Harris, with vocalist Paul Di'Anno co-writing two tracks and guitarist Dave Murray contributing "Charlotte the Harlot".  The 1981 follow-up, "Killers", was written almost entirely by the bassist, with frontman Di'Anno contributing only to the title track, "Killers" (the North American bonus track "Twilight Zone" was credited to Harris and Murray).  Bruce Dickinson replaced Di'Anno after the release of "Killers", although he did not contribute any songwriting to "The Number of the Beast", released in 1982, which featured three songs co-written by guitarist Adrian Smith.  "The Number of the Beast" also spawned Iron Maiden's first UK Singles Chart top ten in the form of "Run to the Hills", which charted at number seven on its release.  It was not until 1983's "Piece of Mind" that the songwriting process became a more varied and collaborative approach, with just four of its nine tracks being credited solely to Harris, two to Dickinson and Smith, one to Harris and Murray, one to Dickinson alone, and one to Harris, Dickinson, and Smith.  The Dickinson and Smith-penned "Flight of Icarus" was the first Iron Maiden single to chart in the United States, reaching number eight on the "Billboard" Mainstream Rock chart. Umphrey's McGee is an American jam band originally from South Bend, Indiana.  The band's approach shares many elements with groups like Phish and the Grateful Dead such as varying set lists, improvisation, playing two sets per night, and allowing fans to tape concerts, they are much more influenced musically by progressive rock artists such as King Crimson, Yes, Pink Floyd, Frank Zappa, The Mahavishnu Orchestra, and early Genesis, as well as heavy metal bands such as Iron Maiden and Van Halen.  The band also identifies The Police, The Beatles, and Led Zeppelin as primary influences.  UM experiments with many musical styles, including rock, metal, funk, jazz, blues, electronic, bluegrass, and folk.
Answer: band