First and foremost a review of this particular track and its relation to the great,late, Cliff Burton.

This particular instrumental track comes from Metallica's 4th album after having gone through tough times two years earlier from Burton's death.
One can notice that it is the tradition of Metallica having instrumental songs since their first album while Burton is still with them
Sadly,this was to be their last, as ever since,Metallica themselves have not penned any instrumentals after Burton's death.
From their first album,Burton has been co-writing some strong tracks and this one in particular.
There is an eerie feeling hearing it as this instrumental has the only one that has lyrics written by Burton in which it is being spoken by Hetfield midway through and the contents itself show how relevant it is to us..the living.
'Tallica diehards will be able to recognize the midsection guitar riff which later resurface on the next album,in one of their "hit" ballads..(you will be able to know which track I am referring to..), which they ironically called it the "Black" album.
Well,a black album it sure is and the "Tallica boys seemed to have not recovered ever since they lost their talismanic bass player.

Myself and the other fans would wish and hope that their upcoming new album,out next year (22 years after Burton's death) will do justice(for all)..(pun unintentional) for us diehards and for Cliff Burton himself..an album that he would at least be proud of..Rest In Peace..Cliff Burton..

p.s. take note that this track is the longest on the album,clocking in at 9:48 and even then it is just an instrumental..