C# Half-diminished Guitar Arpeggio
Guitar arpeggio — fretboard diagram
C# Half-diminished Arpeggio — Notes and Intervals
Notes: C#, E, G, B
Intervals: 1P, 3m, 5d, 7m
Formula: WH-WH-2W
Number of notes: 4
Also known as: m7b5, ø, -7b5, h7, h
The C# Half-diminished arpeggio contains 4 notes (C#, E, G, B). Use the interactive fretboard above to explore this arpeggio on Guitar with different tunings and fret ranges.
When to Use the C# Half-diminished Arpeggio
Play the C# Half-diminished arpeggio whenever a C# Half-diminished 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# Half-diminished arpeggio uses 4 notes (C#, E, G, B) 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# Half-diminished Arpeggio on Guitar
Root your C# Half-diminished arpeggio at fret 9 on the 6th (low E), or alternatively at 4th fret on the A string. This 4-note arpeggio (C#, E, G, B) benefits from economy picking, combining sweep and alternate picking motions. Practice isolating two-string pairs to build coordination before linking the full shape.
The C# Half-diminished arpeggio creates a tense, unstable sound built from minor thirds. It works over C#dim, C#dim7, C#m7b5 chords and is often used as a passing device to create dramatic tension before resolving to a stable chord.
Practice Routine
Play the C# Half-diminished arpeggio as whole notes over a backing track or drone on C#. Focus on intonation and tone quality for each of the 4 notes (C#, E, G, B). After a few passes, begin improvising short melodic phrases built from these arpeggio tones, connecting them with passing notes.
Guitar Tips
On guitar, practice the C# Half-diminished arpeggio using sweep picking across all six strings. Start with downstrokes ascending and upstrokes descending at a slow tempo, keeping each note separated rather than blurred. Mute unused strings with your fretting hand to keep the sound clean.
Related Resources
Explore C# Half-diminished in Other Tunings
- C# Half-diminished in Drop D (E-B-G-D-A-D)
- C# Half-diminished in DADGAD (D-A-G-D-A-D)
- C# Half-diminished in Open G (D-B-G-D-G-D)
- C# Half-diminished in Baritone (B Standard) (B-F#-D-A-E-B)
- C# Half-diminished in 7-string (E-B-G-D-A-E-B)
- C# Half-diminished in 8-string (E-B-G-D-A-E-B-F#)
- C# Half-diminished in Drop C (D-A-F-C-G-C)
- C# Half-diminished in Drop B (C#-G#-E-B-F#-B)
- C# Half-diminished in Open D (D-A-F#-D-A-D)
- C# Half-diminished in Half Step Down (Eb-Bb-Gb-Db-Ab-Eb)
- C# Half-diminished in Open E (E-B-G#-E-B-E)
- C# Half-diminished in Open A (E-C#-A-E-A-E)
- C# Half-diminished in Double Drop D (D-B-G-D-A-D)
- C# Half-diminished in Open C (E-C-G-C-G-C)