Bb Half-Whole Diminished Scale

What is the Bb Half-Whole Diminished Scale?

The half-whole diminished scale reverses the diminished pattern, starting with a half step then a whole step. This version is the classic choice for soloing over dominant 7th chords in jazz — it packs in ♭9, #9, #11, and natural 13 tensions, giving you a dense palette of colorful alterations over a single chord. Here's how the Bb Half-Whole Diminished Scale lays out on the fretboard. This scale is enharmonically equivalent to A# Half-Whole Diminished.

Notes and Positions

Dominant-use symmetric scale starting with a half step. On bass, the fretboard view helps you visualize where the important tones sit for building lines across positions. Use a finger-per-fret approach first, then add shifts only when the line needs a wider range. In the key of Bb, the notes are: Bb, Cb, C#, D, E, F, G, Ab.

How to Use It

You'll often hear it in Jazz, Fusion, and Dominant V chords. A good way to internalize the sound is to sing the root, then sing a few scale degrees before you play them.

Start with the root on beat 1, add the 5th on beat 3, then work the other scale tones in as passing notes. Use the interactive fretboard above to spot repeats of the same note on different strings and frets.