D Ionian — Triads
Three-note stacks of thirds, one per scale degree. The chord-quality pattern below is the Ionian scale's diatonic harmony.
All 7 triads in sequence
Degree 1 · ID
Degree 2 · iiEm
Degree 3 · iiiF#m
Degree 4 · IVG
Degree 5 · VA
Degree 6 · viBm
Degree 7 · vii°C# dim