In music, a chord combines three or more notes played simultaneously. These notes are typically selected from a specific scale or key . They are stacked on top of each other to create a harmonious sound.
Each note within a chord is referred to as a chord tone. The chord tones determine the quality and character of the chord. The triad is the most fundamental chord, consisting of three chord tones: the root, the third, and the fifth. The root is the note on which the chord is built, while the third and fifth are intervals above the root.