Let's try a new take on "How High the Moon." In measure 3 you can see how I move voicing up along the B flat major 6 diminished scale. In measure 5 I harmonize the G in the melody with a full diminished chord as if it were a diminished note from the F major 6 diminished scale - then I move the voicing up the scale. In measures 9 and 10, the changes move from a major 7th chord to the minor ii-V a tritone away. This situation comes up frequently, and in Barry's universe, we can see this as a major chord (E flat) moving to it's relative minor (Cm), with the 6th in the bass (A). The 6 diminished scales are great for contrary motion effects, as you can see in measure 11. In measure 13, I've voiced the E7 with notes from E7 but added two notes from B flat 7 - a related dominant 7th chord.