While you can do an awful lot with those basic three notes, adding additional notes (known as extensions) can completely change the character of your chord, and one of the most influential extended ...

Extended chords add other notes from the scale to the existing root-3rd-5th triad (for example, C-E-G), so if we add a 7th, we’d call this a major 7th chord (C-E-G-B). We can extend up to a 13th ...