Which Metallica song features an intro interpolating Bernstein's “America”?

“Don't Tread on Me” features an intro that interpolates Leonard Bernstein's “America.” Bernstein wrote “America” for the musical West Side Story, so the Black Album track contains a musical reference outside Metallica’s usual heavy-metal vocabulary.

The song appears late in the album’s sequence and takes its title from the phrase associated with the Gadsden flag. Its lyrics and imagery draw on American patriotic symbolism, while the arrangement remains compact and riff-driven.

“Don't Tread on Me” is sometimes mistaken for one of the album’s commercial singles. It was sent to rock radio after the album’s release, but it did not receive a commercial single release like “Enter Sandman,” “The Unforgiven,” “Nothing Else Matters,” “Wherever I May Roam,” or “Sad but True.”

The Bernstein connection is especially easy to miss because the passage is an interpolation rather than a full cover. It links a 1991 Metallica recording to a famous 1957 musical composition.