Modal RunsAdim7 Chord (Diminished 7th)
Fully diminished 7th stacks minor 3rds all the way up — root, flat 3rd, flat 5th, double-flat 7th — a perfectly symmetric chord. The notes of Adim7 are A, C, D#, F#.
Maximum tension with nowhere obvious to land: horror-film harmony, ragtime passing chords, and the chord jazz players use to slide chromatically between two others.
Adim7 voicings on guitar
Every playable, root-in-the-bass grip standard tuning offers, computed from the chord’s own formula — not a fixed shape library.
Because every interval is identical, the same shape moved up three frets is still a dim7 — try sliding it and hear how little actually changes.
Formula and intervals
R - b3 - b5 - 6 — 4 notes.
Scales that fit Adim7
Every scale below contains all of this chord’s notes — safe territory to improvise in over it.
Diminished (HW), Diminished (WH)