The Unforgiven is the fourth track on The Black Album.
In contrast to previous ballads that Metallica had written, this song features a slower, more conventional rock style, and has heavy verses and a soft chorus, rather than the heavy chorus and soft verses that "Fade To Black", "Welcome Home (Sanitarium)" and "One" had. The guitar solo in the song was outcome of Kirk being told to replay the solo multiple times by Bob Rock
The intro to the song features a reversed sample of a western movie The Good, The Bad, and The Ugly specifically The Ecstasy of Gold which Metallica uses as a concert entrance and covered it on We All Love Ennio Morricone
It also includes using an effect known as Doppler which is like a when a train is approaching and the closer the train gets the higher the pitch gets.