Which Metallica song on The Black Album features cello parts added during production?

“The Unforgiven” is the Metallica song on The Black Album that features cello parts added during production.

Producer Bob Rock encouraged the band to use instruments not normally associated with its heavy-metal recordings. Cellos were added to “The Unforgiven,” giving the song a broad, dramatic texture that supports its reflective verses and heavier chorus.

The track was released as the album’s second single in 1991. Its lyrics explore an individual’s struggle against forces that attempt to control or subjugate him, making it one of the record’s more introspective songs.

“The Unforgiven” later became the first entry in a trilogy. “The Unforgiven II” appeared on Reload, while “The Unforgiven III” appeared on Death Magnetic. Those sequels share the numbering concept, but the original song remains the one associated with the cello-enhanced Black Album recording.