IV(iv)6, vi(VI), and iii(III) (6̂  and 3̂  in the Bass)

This chapter introduces the last two stable diatonic triads. The submediant triad, vi, supports 6̂, 1̂, and 3̂, all of which are also supported by harmonies that are more fundamental, reflecting the fact that vi is sometimes thought of as a “bridging” harmony. That is, vi is a chord that lies between harmonies that can be perceived as being more integral to the progression. Although it is easily the least common diatonic triad, iii nevertheless appears from time to time. Being that I and V are far more stable and common, it stands to reason that iii should be little used. Note also that iii, when it does appear, most commonly supports 7̂. One peculiarity pertaining to the III chord in minor keys is that it frequently supports the lowered seventh scale degree, ♭7̂.