Linked from
The 10 pages that link to Triads, each with the reason it gives.
Chord progressionBroader topic: Triads are the basic chord type in many tonal progressions.
HarmonyBroader topic: Triads show how interval stacking creates common chord types.
Close harmonyRelated: Triads provide a basic three-part structure that voices can arrange compactly.
ArpeggioBroader topic: Triads provide the basic three-note forms commonly played as arpeggios.