Which Metallica song was released as The Black Album's second single?

“The Unforgiven” was released as the second single from Metallica's The Black Album.

The single followed “Enter Sandman” in 1991 and showed a different side of the record. Rather than using the conventional pattern of a soft verse followed by a heavy chorus, Metallica reversed the dynamic with heavier verses and a more melodic chorus.

James Hetfield, Kirk Hammett, and Lars Ulrich are credited as the song's composers, with Hetfield writing the lyrics. The song explores an individual's struggle against forces that attempt to control or subjugate him.

The title later became the basis for a Metallica trilogy. “The Unforgiven II” appeared on Reload in 1997, and “The Unforgiven III” appeared on Death Magnetic in 2008. Those later songs are sequels, not alternate names for the 1991 single.