C# Lydian #9 Guitar Scale — Open D

Guitar scale in Open D tuning — fretboard diagram

C# Lydian #9 in Open D — Notes and Intervals

The C# Lydian #9 scale is an exotic and aggressive variation of the Lydian mode. On Guitar, the notes are C#, E, F, G, G#, A#, C. It features a wide melodic gap that gives it a fusion edge, perfect for high-energy solos and modern jazz compositions that require a sharp, biting sound. Commonly used in Fusion, Modern Jazz, Progressive. Notable players include Allan Holdsworth, Brett Garsed. Use over 7#9#11 chords. A specialized fusion tool for adding a sharp, biting edge to Lydian-based lines.

Notes: C#, E, F, G, G#, A#, C

Intervals: 1P, 2A, 3M, 4A, 5P, 6M, 7M

Degrees: 1 #2 3 #4 5 6 7

Formula: WH-H-W-H-W-W-H

Number of notes: 7

Tuning: Open D (D-A-D-F#-A-D)

About Open D Tuning

Open D tuning (D-A-D-F#-A-D) produces a full D major chord when strummed open, creating a warm, resonant sound that has been a staple of slide guitar, folk, and acoustic music for over a century. The three D strings create a deep, droning foundation that makes even simple chord shapes sound lush and full.

Open D is closely related to Open E (same intervals, just a whole step lower) but puts less tension on the guitar neck, making it safer for acoustic instruments. It was a favorite of Joni Mitchell, who used it extensively for her unique chord voicings, and Bob Dylan, who popularized it in folk-rock. For slide players, Open D provides the same intuitive major-chord-at-any-fret approach as Open G but with a warmer, deeper character.

FolkBluesSlide GuitarAcousticSinger-SongwriterCountry

Notable artists: Joni Mitchell, Bob Dylan, Richie Havens, Bruce Cockburn, Elmore James

Best for: Slide guitar, folk fingerpicking, singer-songwriter arrangements, and acoustic compositions with rich open-string resonance

Explore This Scale in Other Tunings

← All Guitar scales in Open D tuning