The Diminished Major 7th Chord Explained — Advanced Harmony for the Serious Jazz Guitarist

The Diminished Major 7th chord sounds exotic, but it shows up in the opening bars of Stella by Starlight, Someday My Prince Will Come, and How Insensitive. This post unpacks how to identify it, how it functions as a dominant upper structure, and why understanding it unlocks a large portion of the jazz standard repertoire.