main riff:

G E E E E E E 
G E E E E E E 
G E A E G E E E E E E 

repeat 4 times...then comes the singin, here plays only bass

then after screaming: "Let There Be Rock" goes backing riff:

A A 
A A
A A
A A

x3

B B
B B
B B
B B
A A
A A
A A
A A
A A A A A A A

second verse its all the same like the first (above):

third verse is like this: 

intro
G E E E E E E 
G E E E E E E 
G E A E G E E E E E E 
x4

then goes guitar riff while singing:

G E A E G E E E E E E x 4

after screaming: "Let There Be Rock" goes backing like this:

A A 
A A
A A
A A

x3

then just play B to the end of the song