Here's a surprisingly simple way to construct a diminished scale using a dominant seventh arpeggio and related approach tones. First, start with a dominant seventh arpeggio. We'll use a Bb7 arpeggio as an example. The notes of a Bb7 are Bb (root), D (3rd), F (5th) and Ab (7th). Bb7 Arpeggio Next, add one approach… Continue reading A Simple Way to Construct a Diminished Scale