Which Metallica song on The Black Album features cello parts?

“The Unforgiven” is the Metallica song on The Black Album that features cello parts. The string parts add a dramatic, mournful color to the song's slow heavy-metal arrangement.

The track was one of the album's major departures from Metallica's earlier thrash-oriented sound. Its restrained verses, orchestral texture, and powerful chorus helped show how the band could use atmosphere without abandoning heavy guitars.

The song became the album's second commercial single, released on October 28, 1991. It later spawned two differently titled follow-ups, “The Unforgiven II” on Reload and “The Unforgiven III” on Death Magnetic. A common mix-up is assigning the album's orchestral association to “Nothing Else Matters”; that song is known for orchestral accompaniment, while “The Unforgiven” is specifically associated with cello parts in the album's production story.