Which song did Jason Newsted write the main riff for on Metallica's The Black Album?

Jason Newsted wrote the main riff for “My Friend of Misery” on Metallica's The Black Album.

The song began as an instrumental idea written by Newsted. It was originally intended to continue a pattern from Metallica’s earlier albums, each of which had included an instrumental track. The finished song instead received lyrics and became the penultimate track on the album.

James Hetfield and Lars Ulrich are credited with Newsted for the song’s composition, while Hetfield wrote the lyrics. Its brooding bass-led character gives it a distinct place within the album’s sequence.

Newsted’s songwriting contribution is sometimes overlooked because Metallica’s material from this period was mainly composed by Hetfield and Ulrich. He was a full member of the recording lineup, however, and “My Friend of Misery” is the clearest Black Album example of his original musical idea shaping a finished track.