A Aeolian — Triads
Three-note stacks of thirds, one per scale degree. The chord-quality pattern below is the Aeolian scale's diatonic harmony.
All 7 triads in sequence
Degree 1 · iAm
Degree 2 · ii°B dim
Degree 3 · IIIC
Degree 4 · ivDm
Degree 5 · vEm
Degree 6 · VIF
Degree 7 · VIIG