D Tritone Scale
D Tritone contains 6 notes: D, E♭, G♭, A♭, A, C. It has 3 flats: E♭, G♭, A♭. The step pattern is H–W+H–W–H–W+H–W.
The tritone scale is a 6-note symmetric scale built from two major triads a tritone apart. It is a modern jazz tool for tritone substitution and ambiguous dominant sounds.
The formula is 1, b2, 3, b5, 5, b7. It contains the notes of two major triads separated by a tritone (e.g., C major + Gb major). Because it holds the 3rd and 7th of both dominant chords, melodies using this scale work equally well over either — the foundation of tritone substitution.
Visualize the two major triads independently on the fretboard, then practice connecting them. The scale is sparse enough (6 notes) that intervallic, angular lines sound more idiomatic than scalar runs.