Watch the (B) Building Major Family Chords online guitar lesson by Fareed Haque from Jazz Comping Survival Guide
Some of the most signature sounds of classic 'jazz guitar' are the major 7th chord, major 9 chord, major 6 chord and the 6/9 chord. In many cases keeping the 7 and 3 guide tones in a major family chord can be a bit dissonant, especially if we have the root in the melody. In many cases jazz musicians replace 3 and/or 7 with their softer, gentler neighbors a step below, the 9th (instead of the 3rd) and the 6th (instead of the 7th). For ex. C maj 6/9 would be E, A, D ,G on top four strings. 3 and 6 as guide tones as well as 9 and 5 on top.