This signature tune by AC/DC is written in the key of E. It begins with a simple E-D-A chord progression with a lead fill built off of the E pentatonic minor. The lead fill may take a little practice to get up to speed.
Here is a rather difficult riff to play. The entire riff is based around the 'B' string with nothing but hammer-ons and pull-offs. It is a great exercise.
This great riff is rather easy, mainly focusing on the bends to drive the song. The riff is based around simple chord formations that hide within the lesson.