Tonic vs. Non-Tonic in the FDA: Getting the Chord Function Right
Knowing whether a chord is tonic or non-tonic in the FDA determines which diagonal line you use — and getting that wrong means the whole system breaks down. This post clarifies the G minor 7 and E-flat major 7 relationship in the key of B-flat and explains how to apply tonic and non-tonic assignments consistently around the circle of fifths.
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