Metallica is an American heavy metal band formed in 1981 in Los Angeles, California. The band was founded by drummer Lars Ulrich and guitarist James Hetfield. Known for their aggressive sound and powerful lyrics, Metallica has become one of the most influential bands in the heavy metal genre, often credited with helping to popularize it worldwide. The band's lineup has changed over the years, but it currently includes Kirk Hammett on lead guitar and Robert Trujillo on bass. Metallica has released several critically acclaimed albums, including Master of Puppets and The Black Album, and has won numerous awards, including multiple Grammy Awards.