Bass chord companion
Learn the Bb 7#5 (Augmented 7) chord on bass with chord tones, intervals, playable arpeggios, and fretboard maps.
Play these tones one at a time to outline the chord. The maps show the complete formula; the numbered exercises give an ascending path, including extensions in their written octave.
Standard four-string bass: E1 – A1 – D2 – G2. String 4 is low E; string 1 is high G. Fingers 1–4 are index through little finger; 0 is open. Use comfortable hand positions and shift where indicated.
Bb 7#5 (Augmented 7) complete chord-tone map around string 4, fret 6. Choose individual tones for a bass line.
Follow steps 1–4 below. Keep one hand position.
| Step | Degree | Note | String / fret | Finger | Position |
|---|---|---|---|---|---|
| 1 | 1 | Bb1 | 4 / 6 | 4 | Fret 3 |
| 2 | 3 | D2 | 2 / 0 | Open | Fret 3 |
| 3 | #5 | F#2 | 2 / 4 | 2 | Fret 3 |
| 4 | b7 | Ab2 | 2 / 6 | 4 | Fret 3 |
Bb 7#5 (Augmented 7) complete chord-tone map around string 3, fret 1. Choose individual tones for a bass line.
Follow steps 1–4 below. Keep one hand position.
| Step | Degree | Note | String / fret | Finger | Position |
|---|---|---|---|---|---|
| 1 | 1 | Bb1 | 3 / 1 | 1 | Fret 1 |
| 2 | 3 | D2 | 2 / 0 | Open | Fret 1 |
| 3 | #5 | F#2 | 2 / 4 | 4 | Fret 1 |
| 4 | b7 | Ab2 | 1 / 1 | 1 | Fret 1 |
Every Bb 7#5 (Augmented 7) Chord chord tone across the neck, with roots highlighted for quick orientation.
Frets 0–24. Select a position or tap a note to hear it.
Try these progressions to hear the harmony in context. On bass, outline each chord with individual target tones.
Use the dominant sound to pull strongly into a stable major tonic.
The same dominant root can resolve into a minor tonic for a darker cadence.
Place the dominant at the end of a turnaround so the next phrase has forward motion.
| Degree | Interval | Note |
|---|---|---|
| 1 | Root | Bb |
| 3 | M3 | D |
| #5 | A5 | F# |
| b7 | m7 | Ab |
1 – 3 – #5 – b7
Compound degrees retain their names: 9, 11, and 13 are extensions. A voicing may place their pitches in a closer register.