"One" by Metallica is originally in the key of B minor. Released in 1988 as part of their album "...And Justice for All," the song was written by James Hetfield and Lars Ulrich, members of Metallica. It is known for its powerful lyrics inspired by Dalton Trumbo's novel "Johnny Got His Gun," which tells the story of a soldier severely wounded in World War I. The song features heavy guitar riffs, intense drumming, and emotional vocals, capturing the horrors of war and the struggle for survival. "One" won a Grammy Award for Best Metal Performance in 1990 and remains one of Metallica's most iconic and enduring songs.