IT’S TIME TO PUT THESE CHORDS TOGETHER. Jazz chords—major sevenths, minor sevenths, ninths, thirteenths, and beyond—add a new level of richness to the sound of chord progressions.
In blues, folk, and country music, the I, IV, and V7 are the most common chords. In jazz and much music with more sophisticated harmony, the II-V-I progression is a cornerstone.
In the harmonized scale, chords are derived by adding two notes, each a third apart, to each note of a major scale. Adding one more note a third higher to each of these chords gives so-called “jazz” chords—major 7ths and minor 7ths.