Watch the 1 5 7 Structures online guitar lesson by Brad Carlton from Guitar Lab: Open String Universe

This lesson uses a root fifth seventh structure on the 5th, 4th and 3rd strings combined with the 2nd and 1st strings open. Voicing 1 is an A Major 9 (no 3) voiced 1 5 7 9 5. Ionian and lydian scales apply to this chord. Voicing 2 is a BMaj7 add4 voiced 1 5 7 1 4. Ionian is the only scale for this chord. Voicing 3 is a CMaj7 voiced 1 5 7 7 3. Ionian and lydian scales are the choices for this voicing. Voicing 4 is a DMaj 13 (no 3) voiced 1 5 7 6 9. Both ionian and lydian scales apply. Voicing 5 is an E Maj7 (no 3) voiced 1 5 7 5 1. Ionian and lydian scales apply. Voicing 6 is an FMaj7 #11 (no 3) voiced 1 5 7 #4 7. Only lydian applies to this chord. Voicing 7 is a GMaj 7/6 voiced 1 5 7 3 6. Ionian and lydian work over this chord.