C# Suspended Fourth Flat Ninth Bass Arpeggio
Bass arpeggio — fretboard diagram
C# Suspended Fourth Flat Ninth Arpeggio — Notes and Intervals
Notes: C#, F#, G#, B, D
Intervals: 1P, 4P, 5P, 7m, 9m
Formula: 5-W-WH-WH
Number of notes: 5
Also known as: b9sus, phryg, 7b9sus, 7b9sus4
The C# Suspended Fourth Flat Ninth arpeggio contains 5 notes (C#, F#, G#, B, D). Use the interactive fretboard above to explore this arpeggio on Bass with different tunings and fret ranges.
When to Use the C# Suspended Fourth Flat Ninth Arpeggio
Play the C# Suspended Fourth Flat Ninth arpeggio whenever a C# Suspended Fourth Flat Ninth chord appears in a progression. Unlike scales (which include passing tones), arpeggios guarantee every note you play IS a chord tone, making your solo sound harmonically precise and intentional.
Arpeggio vs. Scale
The C# Suspended Fourth Flat Ninth arpeggio uses 5 notes (C#, F#, G#, B, D) while the full scale uses 7. The arpeggio is a subset — think of it as the skeleton of the scale. Practice alternating between the arpeggio and the full scale to develop a melodic vocabulary that mixes chord tones with passing tones.
How to Play C# Suspended Fourth Flat Ninth Arpeggio on Bass
On bass, locate C# on the A string at fret 4. Span the 5 notes (C#, F#, G#, B, D) across two to three strings using one finger per fret. Focus on even tone production between plucked strings and smooth position shifts.
The C# Suspended Fourth Flat Ninth arpeggio avoids the third, creating an open, unresolved sound. It works over C#sus4, C#sus2, C#7sus4 voicings and is perfect for creating a modern, ambiguous harmonic feel that neither commits to major nor minor.
Practice Routine
Practice the C# Suspended Fourth Flat Ninth arpeggio in different octaves, starting low and working up. Then try displacing the octaves — play the root low, the F# an octave higher, and continue leaping. This trains your ear to hear the intervals (1P, 4P, 5P, 7m, 9m) in any register.
Bass Tips
Practice the C# Suspended Fourth Flat Ninth arpeggio on bass using a raking technique across adjacent strings for a smooth, flowing sound. Then try the same shape with a two-finger alternating pluck for a more defined, punchy articulation.