is just the Intro for right now. It's in dropped D
[ Tab from: http://www.guitartabs.cc/tabs/m/metallica/all_nightmare_long_tab.html ]
e l----------------------------------------------------------------------------|
B l----------------------------------------------------------------------------|
G l----------------------------------------------------------------------------|
D l-----0-5-6-5-----0-5----5-1-------------------------------------------------|
A l----------------------------------------------------------------------------|
D l---0----------0-----3-0-----------------------------------------------------
|