Which rock band's debut album was "Kill 'Em All" ?

"Kill 'Em All" is the debut studio album by the American heavy metal band Metallica, released on July 25, 1983, by the independent record label Megaforce Records."Kill 'Em All" is regarded as a groundbreaking album for thrash metal because of its precise musicianship, which fuses new wave of British heavy metal riffs with hardcore punk tempos. The album's musical approach and lyrics were markedly different from rock's mainstream of the early 1980s and inspired a number of bands who followed in similar manner. The album did not enter the Billboard 200 until 1986, when it peaked at number 155, following Metallica's commercial success with its third studio album "Master of Puppets".

Metallica was formed in 1981 in Los Angeles by drummer Lars Ulrich and vocalist/rhythm guitarist James Hetfield. Before settling on a definitive lineup, Metal Blade Records owner Brian Slagel asked Metallica to record a song for the first edition of his Metal Massacre compilation. Hetfield and Ulrich chose "Hit the Lights" from Hetfield's previous band Leather Charm, and recorded it with Hetfield on vocals, his childhood friend Ron McGovney on bass, and temporary guitarist Lloyd Grant. The band's first lineup featured Hetfield, Ulrich, McGovney, and guitarist Dave Mustaine, who was acquired through a newspaper advertisement. The band practiced in McGovney's garage and looked for gigs at local clubs. Metallica's first show was on March 14, 1982, at the Radio City in Anaheim.