Triads are three-note chords built with a root note, third interval, and fifth interval. They’re constructed using tertian harmony, meaning all the notes are stacked in thirds.
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There are four different types of triads:
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​Major: 1, 3, 5
​Minor: 1, b3, 5
​Augmented: 1, 3, #5
​Diminished: 1, b3, b5