What is the C 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 C Half-Whole Diminished Scale lays out on the fretboard.
Notes and Positions
Dominant-use symmetric scale starting with a half step. On guitar, you can treat this as both a lead vocabulary and a way to see chord tones inside common shapes. Start with one box, then connect it to the nearest root on the next string set. In the key of C, the notes are: C, Db, D#, E, F#, G, A, Bb.
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 by playing one position slowly and saying the note names or degrees out loud. Use the interactive fretboard above to spot repeats of the same note on different strings and frets.