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Writing and recording: [...] "Enter Sandman" evolved from a guitar riff that Hammett wrote. Originally, the riff was two bars in length, but Ulrich suggested the first bar be played three times. The instrumental parts of the song were quickly finished, but Hetfield did not come up with vocal melodies and lyrics for a long time. The song was among the album's last to have lyrics, and the lyrics featured in the song are not the original; Hetfield felt that "Enter Sandman" sounded "catchy and kind of commercial" and so to counterbalance the sound, he wrote lyrics about "destroy[ing] the perfect family; a huge horrible secret in a family" that included references to crib death. For the first time in Metallica's history, however, Ulrich and producer Bob Rock told Hetfield that they felt he could write better lyrics. Nevertheless, according to Ulrich, the song was the "foundation, the guide to the whole record" even before it had lyrics.