This is the Backing Track without Vocals from Enter Sadman Lesson.
“Enter Sandman” is a song by American heavy metal band Metallica. It was released as the first single from their self titled fifth album, Metallica in 1991. The music was written by Kirk Hammett, James Hetfield and Lars Ulrich. Vocalist and rhythm guitarist Hetfield wrote the lyrics, which deal with the concept of a child’s nightmares.
Sample Audio (20s):