In music theory, an extension is similar in concept to a house extension, except that, rather than three-bed semis, we’re dealing with three-note chords. By definition, to extend is to make something ...

How to build and notate chords Posted: June 9, 2026 | Last updated: June 9, 2026 Alright now we're talking about diminished chords. You can draw two boxes, we'll have a minor 3rd on top, and a minor ...