Explore C# 9b5 Guitar Chord Shapes on the Fretboard

The C#9b5 chord, C# ninth flat five, contains C#, E#, G, B and D#. The G is the lowered fifth, a diminished fifth above C#, and the D# is the ninth. The B is the minor seventh, a whole step below the octave.

Three voicings are listed, all barres, and the lowest is at the 3rd fret. The lowered fifth is the raised fourth of the C# Lydian dominant scale, which contains all five notes and makes a colourful choice for melodies.

Play a shape into the microphone check to see which strings ring through the barre.

C# 9th with flat 5th guitar chord is also written as C#9b5, C#9(b5) or C#9-5.

Notes in the C# 9b5 chord:

C# E# G B D#

Tones of the Dominant Ninth Flat five chord:

Formula: 1 3 b5 b7 9

C# 9b5 Chord Interactive Fretboard

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Go to the full guitar chords tutorial.

C# 9b5 Guitar Chord Diagrams

Position 1 Barre Movable

Finger Positions

Place your index finger (1) on the fret 3 of the low E, D and high E strings at the same time
Place your middle finger (2) on the fret 4 of the A string
Place your ring finger (3) on the fret 4 of the G string
Place your pinky finger (4) on the fret 4 of the B string

Position 2 Barre Movable

Finger Positions

Place your index finger (1) on the fret 8 of the A, G and B strings at the same time
Place your middle finger (2) on the fret 9 of the low E string
Place your ring finger (3) on the fret 9 of the D string
Place your pinky finger (4) on the fret 9 of the high E string

Position 3 Barre Movable

Finger Positions

Mute the low E string
Mute the A string
Place your index finger (1) on the fret 11 of the D and high E strings at the same time
Place your middle finger (2) on the fret 12 of the G string
Place your ring finger (3) on the fret 12 of the B string

Find more shapes in our all guitar chords online library. If you prefer a printable pdf, download the Free Guitar Chords Chart Pdf

Play This Chord With Other Roots

C 9b5 | D 9b5 | E 9b5 | F 9b5 | G 9b5 | A 9b5 | B 9b5 | C#9b5 | D#9b5 | F#9b5 | G#9b5 | A#9b5 | Ab9b5 | Bb9b5 | Db9b5 | Eb9b5 | Gb9b5

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Created by

Giancarlo Facoetti

Giancarlo is a musician (teaching guitar since 2000), software engineer, AI consultant and published researcher

FAQ

Which notes spell C#9b5?

C#9b5 is C#, E#, G, B and D#. The G is the lowered fifth and the D# is the major ninth over the root.

How is C# ninth flat five different from C#7b5?

C#7b5 has C#, E#, G and B. C#9b5 keeps those four and adds D#, a major ninth over the root.

Is C#9b5 also written Db9b5?

Yes. Db9b5 uses Db, F, Abb, Cb and Eb, the same pitches as C#, E#, G, B and D#. The double flat makes C#9b5 simpler to read.

Which scale contains all of C#9b5?

The C# whole-tone scale is C#, D#, E#, F##, G## and B. All five chord pitches are in it, with the chord's G written as F##.

How many C#9b5 voicings can I play?

There are 3 voicings, between fret 3 and fret 12. All 3 are barre voicings and none uses an open string.