Metallica is an American thrash metal/heavy metal band. The band started in Los Angeles in 1981, and helped make the thrash sub-genre of heavy metal. The band is one of the "Big Four" of early thrash metal, with Megadeth, Slayer, and Anthrax. They are well known for many of their songs, including "Master of Puppets", "The Unforgiven", "One", "Enter Sandman", and "Nothing Else Matters". Since then, they have become one of the most popular and successful bands in metal, and have sold over 100 million albums worldwide. The band's fifth album, Metallica, has sold over 22 million copies, making it one of the top 20 best selling albums of all time. Metallica's current members are guitarist and singer James Hetfield, drummer Lars Ulrich, guitarist Kirk Hammett and bassist Robert Trujillo. Hetfield and Ulrich write most of the band's songs.