DOWNLOAD ONLY. This is a DOWNLOAD ONLY Homespun single song lesson. Knowing double stops is a great way to learn the fretboard and develop riffs of your own. In this lesson pro guitarist Adam Traum teaches harmonized scales and the fundamental theory behind double stops to help you create dynamic solos for blues in the key of E. He teaches some cool licks that will add to any aspiring player's bag of tricks, along with patterns in the key of E that you can apply to other keys.