Bear witness to some of Cliff Burton's most spectacular bass work in this (quite subjectively labelled on my part) masterpiece. The mix is a little low on bass, so you'll need to run it through some sort of EQ to hear the crazy bass-soloing that is almost continuous throughout the song. (something which I was completely unaware of for a few years)

To all you aspiring guitarists: learning the solos to this song is a great way of learning to solo (full stop).