One is a song by American heavy metal band Metallica, released on their 1988 album ...And Justice for All. Built around a soldier's story of isolation and inner struggle, it moves from quiet, restrained passages to a fast, aggressive climax, a structure that helped make it one of the band's most enduring tracks. It won Metallica their first Grammy Award for Best Metal Performance in 1990, and it remains a staple of their live sets and rock playlists, which is why short clips of it still circulate widely in fan edits.