Just as the augmented chord can be repeated every two or four frets on a guitar because of its note makeup (stacked major 3rds), so the diminished can be repeated every three frets since it is made up ...

Here’s my go-to practice routine for tackling altered dominant chords—especially those spicy #5/#9 voicings—and the diminished whole-tone scale (aka the 7th mode of the melodic minor). These sounds ...