Readers' Poll: The 10 Best Metallica Songs

The closest that Metallica ever got to prog rock was their 1986 instrumental from Master of Puppets. The song is more than eight minutes long and was named after the constellation Orion because it has a spacey bridge. Cliff Burton played a huge role in the writing of this song, and his bass solo is arguably his greatest moment in the band's history. The song is still in the group's live rotation, but it hasn't quite sounded right since Cliff passed away.