Watch the Chords Diads online guitar lesson by Stu Hamm from Stu Hamm U: Fretboard Fitness

This section starts our mini-course on chords. Let's start with a real basic intro by learning what makes a chord major or minor (it's the 3rd) and you'll learn how to play major and minor 10ths to train your fingers and ears to tell the difference between major and minor. A 2 note chord, or dyad, is the most basic chord and uses the root to establish a tonic tonality, and a major or minor 3rd (or 10th) to establish a major or minor tonality.