the Lights". Leather Charm soon disbanded and the band's primary songwriter, vocalist/rhythm guitarist James Hetfield, met drummer Lars Ulrich through a classified advertisement. Together, Hetfield and Ulrich formed Metallica, one of the "Big Four" thrash bands, with lead guitarist Dave Mustaine, who would later form Megadeth, another of the "Big Four" originators of thrash, and bassist Ron McGovney. McGovney would be replaced by Cliff Burton (formerly of Trauma), and Mustaine was later replaced by Kirk Hammett of the then-unsigned Bay Area thrash metal act Exodus, and at Burton's insistence, the band relocated to the San Francisco Bay Area. Before Metallica had even settled on a definitive lineup, Metal Blade Records executive Brian Slagel asked Hetfield and Ulrich (credited as "Mettallica") to record "Hit the Lights" for the first edition of his Metal Massacre compilation in 1982. An updated version of "Hit the Lights" would later open their first studio album, Kill 'Em All, released in mid-1983. The term "thrash metal" was first used in the music press by Kerrang! magazine's journalist Malcolm Dome while referring to another of the "Big Four", Anthrax (who, like Metallica, formed in 1981), and their song "Metal Thrashing Mad". Before this, Metallica frontman James Hetfield referred to his band's sound as speed metal or power metal. Another "Big Four" thrash band formed in Los Angeles in 1981, when guitarists Jeff Hanneman and Kerry King met while auditioning for the same band and subsequently decided to form a band of their own. Hanneman and King recruited vocalist/bassist Tom Araya and drummer Dave Lombardo, and Slayer was formed. Slayer was discovered by Metal Blade Records executive Brian Slagel; the band's live performance of Iron Maiden's "Phantom of the Opera" so impressed him that he promptly signed them to his label. In December 1983, four months after the release of Metallica's debut Kill 'Em All, Slayer released their debut album, Show No Mercy. To the north, Canada produced influential thrash and speed metal bands such as Annihilator, Anvil, Exciter, Razor, Sacrifice, and Voivod. Mid-1980s The popularity of thrash metal increased in 1984 with the release of Metallica's sophomore record Ride the Lightning, as well as Anthrax's debut Fistful of Metal. Slayer and Overkill released extended plays on independent labels during this era, Haunting the Chapel and Overkill respectively. This led to a heavier-sounding form of thrash, which was reflected in Exodus' Bonded by Blood and Slayer's Hell Awaits.