Which Metallica song originally began as an instrumental written around Jason Newsted's main riff?

My Friend of Misery originally began as an instrumental built around a main riff written by Jason Newsted. It appears on Metallica's 1991 album, commonly called The Black Album.

Newsted had brought the riff to the band, and the initial idea was connected to Metallica's earlier practice of including an instrumental on each album. The group ultimately developed it into a vocal song instead.

The finished track features lyrics and vocals by James Hetfield, with the songwriting credited to Hetfield, Lars Ulrich, Kirk Hammett, and Newsted. Its darker, more atmospheric character distinguishes it from several of the album's more direct singles.

The song is often discussed when fans examine Newsted's songwriting contributions. Although he received limited writing credit on some Metallica recordings, his riff was central to the creation of My Friend of Misery.