Question 1

What are the diatonic chords of D Lydian #9?

Accepted Answer

The diatonic chords of D Lydian #9 are built by harmonizing each degree of the scale in thirds. The scale degrees are 1 ♯2 3 ♯4 5 6 7 and the intervals are 3H-H-W-H-W-W-H. The triads are: D major, F diminished, F# minor, G# diminished, A augmented, B minor, C# major.

Question 2

What is scale harmonization?

Accepted Answer

Scale harmonization is the process of building chords from each degree of a scale by stacking thirds. Each note of the scale becomes the root of a chord, producing a set of diatonic chords (triads and seventh chords) that naturally belong to that key.

Question 3

What is Practice Mode in the Scale Harmonizer?

Accepted Answer

Practice Mode is an interactive study tool that cycles through all diatonic chords with a synchronized fretboard visualization (switch between scale and arpeggio view), adjustable tempo (40–240 BPM), and audio playback. It includes ii-V-I progressions and secondary dominant exercises — the fretboard automatically shows the contextually correct scale for each chord (e.g., Dorian for the ii, Mixolydian for the V7).

D lydian #9 chords

D lydian #9 scale diatonic chords

D lydian #9 scale seventh chords

D lydian #9 — Tres Cubano scale

D lydian #9 scale — chords and intervals

D lydian #9 scale diatonic chords

D lydian #9 scale seventh chords