
These chords are great for substituting major chords. They are very cool because they have a more ambiguous and rich sound. 6/9 voicings offers a very interesting sound.The sixth (6) is simply played instead of the seventh (7). Major 6 chords (diagram 3) are very played in jazz music and works generally very well in place of any major chord.Needless to overload the chord with a second root.
The lower fifth (5) is left out and the major seventh (7) in place of the second root. Here are some possible chord embellishments based on common major bar chords : That makes powerful chords not highly desired in jazz, that's why we have to make some changes in order to highlight the most important notes of the chord. Some of these tones are repeated, the root (R) and the fifth (5). You can notice that there are the three tones (root, major third and perfect fifth) that a major chord must have in its composition. The diagrams on the left represent the common shapes to play major bar chords on the guitar. It is also possible to replace the seventh with the sixth, this would give a major sixth chord and eventually add extensions as the 9, 11 and 13 to these chords. Then, the triad becomes a tertrad chord that is actually a set of four notes. The first thing to do when you want to make a basic chord more "jazzy" is to add the seventh. These three notes are considered as the "skeleton" of the chord.
Let's start with Major chords which are basically made up of a root (1), a major third (3) and a perfect fifth (5).