John Marshall is a former guitarist for the thrash metal band Metal Church (1986–1993, 1998–2001).
 He was the guitar tech for Metallica's lead guitarist Kirk Hammett.
 Marshall also became the fill-in rhythm guitarist for James Hetfield in 1986 (while still performing his duties as guitar tech) while Hetfield's wrist was broken due to a skateboarding accident, and again in 1992 when Hetfield was recovering from pyrotechnics burn injuries stemming from a concert with Guns N' Roses in Montreal during the Guns N' Roses/Metallica Stadium Tour.
 He also briefly played in progressive thrashers Blind Illusion (which also featured Les Claypool and Larry LaLonde of Primus).
Roland Jazz Chorus is the name given to a series of solid-state instrument amplifiers produced by the Roland Corporation in Japan since 1975.
 Its name comes from its built-in analog chorus effect.
 The Jazz Chorus series became increasingly popular in the late 1970s and early 1980s new wave and post-punk scenes because of its clean yet powerful sound, durability and relatively low cost when compared to the more commonly used tube amplifiers of the time such as Marshall or Fender.
 It also found favour amongst funk players in America.
 It also became popular to use for clean tones in heavy metal, with the most famous users being James Hetfield and Kirk Hammett from Metallica.
The ESP Kirk Hammett (or just ESP KH) is a range of electric guitars (almost all of a double-cutaway superstrat design with reversed headstocks) produced by ESP Guitars, based on the custom models of Kirk Hammett.
 All KH models were designed by Kirk Hammett and Matt Masciandaro.
Spastik Children was a punk rock supergroup founded by Fred Cotton, James McDaniel and Rich "Jumbo" Sielert (vocalist of "Pillage Sunday").
 Sielert, the drummer, was later replaced by Metallica's James Hetfield and Metallica's Cliff Burton joined on bass.
 After Burton's passing, he was replaced by Kirk Hammett, also of Metallica.
 Spastik Children allowed the members of Metallica to have fun and explore a less serious side of their musical talents.
 The band performed only in clubs and bars in Northern California.
 Their music was a raw punk style, occasionally performed with little or no rehearsal.
 James McDaniel and Fred Cotton's influences for Spastik were bands such as Fang, Flipper, Pillage Sunday and the Mentors.
 Jim Martin later joined the band as a second bass player.
 The music was, according to friends of the band, amazing at times but mostly hilariously atrocious.
"Fuel" is a song by American heavy metal band Metallica.
 The song was written by James Hetfield, Lars Ulrich, and Kirk Hammett, and was released as the third single from their seventh album, "Reload".
 Metallica have frequently played the song in concert over the years, including the 1999 live album "S&M" with Michael Kamen conducting the San Francisco Symphony Orchestra.
 Fuel was nominated for a Grammy Award for Best Hard Rock Performance in 1999 but lost to Jimmy Page and Robert Plant for the song "Most High".
Metallica is an American heavy metal band based in San Rafael, California.
 The band was formed in 1981 in Los Angeles when vocalist/guitarist James Hetfield responded to an advertisement posted by drummer Lars Ulrich in a local newspaper.
 Metallica's current lineup comprises founding members Hetfield and Ulrich, longtime lead guitarist Kirk Hammett, and bassist Robert Trujillo.
 Guitarist Dave Mustaine (who went on to form Megadeth) and bassists Ron McGovney, Cliff Burton, and Jason Newsted are also former members of the band.
The Damage, Inc.
 Tour was a concert tour by American thrash metal band Metallica in support of the band's third studio album, "Master of Puppets".
 The name of the tour is taken from the last song on the album.
 It began on March 27, 1986 and ended on February 13, 1987.
 Metallica supported Ozzy Osbourne from March to August, headlined a string of U.S. dates between May 23 and June 7 with Armored Saint, and were the main act throughout the fall and winter with support from Anthrax and Metal Church.
 Roadie John Marshall, who also played guitar in "Metal Church", filled in for James Hetfield on rhythm guitar between July 27 and September 25 following a mid-tour skateboarding accident resulting in a broken arm.
 Hetfield, Cliff Burton and Kirk Hammett originally decided to dismiss Lars Ulrich upon completion of the tour, but plans were set aside upon the death of Burton on September 27, 1986 in a tour bus accident near Ljungby, Sweden while en route from Stockholm to Copenhagen, Denmark.
 Performances that were scheduled for October were postponed and the band hired a new bassist, Jason Newsted to complete the rest of the tour.
 Metallica also became the first band of the Big Four to cross the Iron Curtain, with two concerts in Katowice, Poland on February 10 and 11, 1987.
Metallica is an American heavy metal band, founded in 1981 by drummer Lars Ulrich and rhythm guitarist James Hetfield.
 Aside from Ulrich, the original lineup for some of the 1982 concerts included James Hetfield (rhythm guitar and lead vocals), Dave Mustaine (lead guitar and backing vocals) and Ron McGovney (bass guitar).
 Cliff Burton replaced McGovney in 1982 and played with the band until his death in 1986.
 After his death, bassists Jason Newsted (1986–2001), and Robert Trujillo (since 2003) were recruited in the band.
 While the lead guitarist role was taken by Kirk Hammett (since 1983) after Dave Mustaine got fired from the band.
Lars Ulrich {'1': ", '2': ", '3': 'R', '4': "} ( ; ] ; born December 26, 1963) is a Danish musician, songwriter, actor, and record producer.
 He is best known as the drummer and co-founder of the American heavy metal band Metallica.
 The son of tennis player Torben Ulrich and grandson of tennis player Einer Ulrich, he also played tennis in his youth and moved to Los Angeles at age 16 to train professionally.
 However, rather than playing tennis, Ulrich began playing the drums.
 After publishing an advertisement in "The Recycler", Ulrich met vocalist/guitarist James Hetfield and formed Metallica.
"Enter Sandman" is a song by American heavy metal band Metallica.
 It was released as the first single from their eponymous fifth album, "Metallica" in 1991.
 The music was written by Kirk Hammett, James Hetfield and Lars Ulrich.
 Vocalist and rhythm guitarist Hetfield wrote the lyrics, which deal with the concept of a child's nightmares.

Question: What nationality is the musician who wrote the music of the song Enter Sandman, with Kirk Hammett and James Hetfield ? 
Answer: Danish