A Single-Scale ApproachThe chord structure of the A sections of rhythm changes can be reduced to the fundamentalframework shown in Figure 19.5.While mm. 1–4 of any A section feature a tonic prolongation, mm. 5–8 are morecomplicated even at the background level. For instance, the predominant in mm. 6, 14,and 30 can take the form of major 7th or dominant 7th chords. Also, the tonally closed256 INTERMEDIATEFIGURE 19.5 Fundamental Harmonic Frameworks