A Half-diminished Bass Arpeggio
Bass arpeggio — fretboard diagram
A Half-diminished Arpeggio — Notes and Intervals
Notes: A, C, Eb, G
Intervals: 1P, 3m, 5d, 7m
Formula: WH-WH-2W
Number of notes: 4
Also known as: m7b5, ø, -7b5, h7, h
The A Half-diminished arpeggio contains 4 notes (A, C, Eb, G). Use the interactive fretboard above to explore this arpeggio on Bass with different tunings and fret ranges.
When to Use the A Half-diminished Arpeggio
Play the A Half-diminished arpeggio whenever a A 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 A Half-diminished arpeggio uses 4 notes (A, C, Eb, G) 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 A Half-diminished Arpeggio on Bass
On bass, locate A on the E string at fret 5. Span the 4 notes (A, C, Eb, G) across two to three strings using one finger per fret. Focus on even tone production between plucked strings and smooth position shifts.
The A Half-diminished arpeggio creates a tense, unstable sound built from minor thirds. It works over Adim, Adim7, Am7b5 chords and is often used as a passing device to create dramatic tension before resolving to a stable chord.
Practice Routine
Start by playing the A Half-diminished arpeggio ascending and descending at 60 BPM, one note per beat, using a metronome. Once even and confident, play it in eighth notes, then triplets, keeping each note articulate. Spend at least 5 minutes daily on this before moving to musical application.
Bass Tips
Practice the A Half-diminished 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.