Watch the Chordal Riff Rhythm online guitar lesson by TrueFire from Play Rock Guitar 1: Quick-Start for Beginners

Deep Purple's "Smoke on the Water" is about as much of a "classic" rock riff as you can find. This one is interesting because while you are playing two notes at a time it isn't the normal power chord shape that you know. This song also will help you work on the accuracy of your picking hand as well.