F Half Whole Diminished on Vihuela

F Half Whole Diminished runs 8 notes to the octave. Below it is mapped onto this instrument's A–D–G–B–E fretboard with every F marked, because what a player needs mid-number is not the pattern but where the root is when the harmony moves under it.

Tense, symmetrical, and slightly sinister — alternating half and whole steps pack in the b9, #9, #11, and 13, so it sounds like a dominant chord stretched to breaking point. Edgy, jazzy, and restless.

Heard in: Jazz lines over 13b9 dominant chords, fusion, film-noir and horror scoring — the sound of a V chord that refuses to settle.

The armonía is not a soloing section, so a scale here is diagnostic rather than melodic: it is how a player finds which tones a grip is actually putting in the air on a neck whose octaves do not run in order.

Take it slowly against the playback until the geometry stops being geometry, then put it under a number in F major or minor and let the written line pick its own notes out of it.