@voltronic The Neapolitan 6th chord is a chromatic chord that typically appears in Western classical music. It is usually a major triad built on the lowered second scale degree in a major key, creating a flat II chord. In terms of chord progression, the Neapolitan 6th chord is often used as a predominant chord, serving as a chromatic substitute for the IV or ii chord. It adds color and tension to the harmony and can create a sense of resolution when it progresses to the dominant or V chord. A common harmonic sequence where you might find the Neapolitan 6th chord is in a ii - N6 - V - I progression . The Neapolitan 6th chord provides a smooth chromatic voice leading between the ii and V chords and adds an expressive quality to the progression. Ultimately, the effectiveness of using the Neapolitan 6th chord in a chord progression depends on the musical context, style, and the composer's creative intentions. Feel free to experiment with its placement in different harmonic contexts to see where it best fits within your composition.