Evolution of the Jazz Blues Form - Page 2
by Kerry Galloway
"Extensions" began to be used more and more. They are tones from the scale that the chord is derived from that AREN'T chord tones. The 9th and 13th degrees of the scale were common.
"Pivot" or "turnaround" chords became common at the end of the form in bar 12. They signal a return to the top of the form. <