Here’s a great lesson on double stops from the guys at Truefire.com. In this lesson Jeff McErlain shows you how to play a blues riff in the key of G using double stops at the start. A double stop is when you play two notes at one – in this riff it’s the first and third note. This riff is loosely based on a Robben Ford lick. If you enjoy the sound of this make sure you check out Robben’s stuff.