Question: Torben Ulrich is a Danish writer, musician, filmmaker, painter, director, performer and former amateur then professional tennis player, and the father of Metallica drummer Lars Ulrich, a Danish musician, songwriter, actor, and record producer, he is best known as the drummer and co-founder of which American heavy metal band ?
Context: Metallica is an American heavy metal band from Los Angeles, California.  The band was founded in 1981 by drummer Lars Ulrich and vocalist and rhythm guitarist James Hetfield, alongside lead guitarist Dave Mustaine and bassist Ron McGovney.  Mustaine and McGovney were later replaced by Kirk Hammett and Cliff Burton, respectively.  Burton died in 1986 and was replaced by Jason Newsted, who remained in the band until 2001, before Robert Trujillo joined.  Since its first live concert on March 14, 1982, Metallica has played 2,012 official shows.  As of their show on September 16, 2017, the band has performed 164 songs and medleys live. 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. Torben Ulrich (born October 4, 1928) is a Danish writer, musician, filmmaker, painter, director, performer and former amateur then professional tennis player.  He is the father of Metallica drummer Lars Ulrich. Metallica is an American heavy metal band formed in Los Angeles, California in 1981.  The band released its debut album "Kill 'Em All" in 1983, which credited songwriting between frontman James Hetfield, drummer Lars Ulrich and guitarist Dave Mustaine, who had left before the album was recorded (bassist Cliff Burton was credited for the bass solo "(Anesthesia) – Pulling Teeth").  On the 1984 follow-up "Ride the Lightning", Burton received more songwriting credits and Mustaine's replacement Kirk Hammett was also co-credited on four songs. " Master of Puppets", released in 1986, was the last album to feature Burton, who died in a bus accident later that year. New Wave of British Heavy Metal '79 Revisited is a compilation album of various songs by various artists of the NWOBHM.  The compilation was assembled by Metallica drummer Lars Ulrich and music journalist Geoff Barton and released in 1990 on Caroline Records and later Metal Blade Records. 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. Systematic was an American hard rock band from Oakland, California.  They were one of the first signings to Metallica drummer Lars Ulrich's record label, The Music Company, via Elektra Records.  The band released two studio albums before disbanding in 2004. James Alan Hetfield (born August 3, 1963) is an American musician, singer, and songwriter known for being the co-founder, lead vocalist, rhythm guitarist, and main songwriter for the American heavy metal band Metallica.  Hetfield is mainly known for his intricate rhythm playing, but occasionally performs lead guitar duties and solos, both live and in the studio.  Hetfield co-founded Metallica in October 1981 after answering a classified advertisement by drummer Lars Ulrich in the Los Angeles newspaper "The Recycler".  Metallica has won nine Grammy Awards and released ten studio albums, three live albums, four extended plays and 24 singles. Load is the sixth studio album by the American heavy metal band Metallica, released on June 4, 1996 by Elektra Records in the United States and by Vertigo Records internationally.  The album showed more of a hard rock side of Metallica than the band's typical thrash metal style, which alienated much of the band's fanbase.  It also featured influences from genres such as Southern rock, blues rock, country rock and alternative rock.  Drummer Lars Ulrich said about "Load"'s more exploratory nature, "This album and what we're doing with it – that, to me, is what Metallica are all about: exploring different things.  The minute you stop exploring, then just sit down and fucking die."
Answer: Metallica