Guitar Chords: Triads
Triads are a group of 3 notes that form a major or minor chord.
A chord is made up of at least 3 notes of the major scale; the first or root note, the third and the fifth. These three notes are also known as a triad.
Example: using the C Major Scale, the notes shown in red are used to play a C Major triad.
Major triads are formed by the first (root), third, and fifth notes of the major scale.
Minor triads are formed by the first (root), flat third, and fifth notes of the major scale.
Notes Used to Play Major and Minor Triads
Other guitar chords such as open and barre chords use the same three notes as triads multiple times to form those chords.
Different chord voicings are created by adding different notes from the scale. For instance, a major seventh chord is made by adding the seventh note of the scale along with the first, third, and fifth notes.