The discography of American heavy metal band Metallica includes 11 studio albums, one covers album, eight live albums, three extended plays, 49 singles, 10 video albums, 43 music videos, one soundtrack album, one collaboration album and three box sets. They are a San Francisco-based metal band formed in 1981 by James Hetfield and Lars Ulrich (drums). After several bassist and lead guitarist changes, the band settled on Cliff Burton and Kirk Hammett, respectively. Metallica started playing locally, releasing their first widely circulated demo, No Life 'til Leather, in 1982. The demo caught the attention of Johny Zazula, who signed Metallica to Megaforce Records.