Watch the 1 5 6 3 Structures online guitar lesson by Brad Carlton from Guitar Lab: Open String Universe

This lesson uses a root fifth sixth third structure on the 6th through 3rd strings combined with the 2nd and 1st strings open.

Voicing 1 is a D6/9 voiced 1 5 6 3 6 9. Ionian, lydian, mixolydian and overtone apply. Voicing 2 is an E6 voiced 1 5 6 3 5 1. Ionian, lydian, mixolydian, overtone and half-whole diminished apply.