Metallica's 'Until It Sleeps' stands as a defining track from their 1999 collaboration with the San Francisco Symphony. Originally written for the band's self-titled 1991 album, the song was reimagined for the S&M project, blending heavy metal riffs with sweeping orchestral arrangements. This recording highlights the group's ability to adapt their signature sound for a symphonic setting, creating a dynamic interplay between electric guitars and classical instruments. The track remains a staple in their live repertoire, showcasing the enduring power of their composition when expanded by a full orchestra. It serves as a testament to the band's versatility and their willingness to explore new sonic territories while maintaining their core identity.