495 / 18210 · Module 12 — Secondary Dominants: How to Make Chords Pull Toward Other Chords← prev⊞ allnext →
12.37Dominant seventh versus major seventh again
Very important:
E7 → Am
not:
Emaj7 → Am
E7:
E G♯ B D
The D natural is crucial dominant color.
Emaj7:
E G♯ B D♯
completely different sound and function.
So a secondary dominant is normally a dominant seventh, not merely a major chord with a seventh.