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Watch the 1 3 7 Structures online guitar lesson by Brad Carlton from Guitar Lab: Open String Universe

This lesson uses a root third seventh structure on the 5th, 4th and 3rd strings combined with the 2nd and 1st strings open. Voicing 1 is a BMaj7 add4 voiced 1 3 7 1 4. This chord would be a subset of the ionian mode only. Voicing 2 is a CMaj7 voiced 1 3 7 7 3 and would accept the ionian and lydian modes. Voicing 3 is a DMaj13 voiced 1 3 7 6 9. This chord would be a subset of the ionian and lydian modes. Voicing 4 is an EMaj7 voice 1 3 7 5 1. This chord is contained within both the ionian and lydian modes. Voicing 5 is an FMaj7 b5 voiced 1 3 7 b5 7. This chord would use only the lydian mode. Voicing 6 is a GMaj7/6 voiced 1 3 7 3 6. Both the ionian and lydian modes would apply. Voicing 7 is an A Maj9. It is voiced 1 3 7 9 5 and would be contained within the ionian and lydian votes.