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67.34Level 15 — melody note plus bass defines possibilities
Suppose melody is E.
Bass is B.
What can E mean?
Over B7: 11 — often tense against D♯.
Over Em/B: root of Em.
Over Cmaj7/B: 3 of C over leading-tone bass.
Several possibilities.
The two boundary voices do not uniquely determine the middle harmony.
That is your creative space.