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Bass chord companion

B Diminished 7 Chord

Learn the B Diminished 7 chord on bass with chord tones, intervals, playable arpeggios, and fretboard maps.

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1Bb3Db5Fbb7Ab

Bass chord tones and arpeggios

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.

Root on E string

B Diminished 7th complete chord-tone map around string 4, fret 7. Choose individual tones for a bass line.

B Diminished 7th Root on E string bass chord-tone mapB Diminished 7th complete chord-tone map around string 4, fret 7. Choose individual tones for a bass line.EADG6789101b3b5bb71b3b5

Ascending arpeggio

Follow steps 1–4 below. Keep one hand position.

B Diminished 7th Root on E string numbered bass arpeggioAscending complete formula: B1, D2, F2, Ab2. Play one numbered note at a time.EADG56781234
StepDegreeNoteString / fretFingerPosition
11B14 / 73Fret 5
2b3D23 / 51Fret 5
3b5F23 / 84Fret 5
4bb7Ab22 / 62Fret 5

Root on A string

B Diminished 7th complete chord-tone map around string 3, fret 2. Choose individual tones for a bass line.

B Diminished 7th Root on A string bass chord-tone mapB Diminished 7th complete chord-tone map around string 3, fret 2. Choose individual tones for a bass line.EADG12345b5bb71b3b5bb71

Ascending arpeggio

Follow steps 1–4 below. Keep one hand position.

B Diminished 7th Root on A string numbered bass arpeggioAscending complete formula: B1, D2, F2, Ab2. Play one numbered note at a time.EADG01231234
StepDegreeNoteString / fretFingerPosition
11B13 / 22Fret 1
2b3D22 / 0OpenFret 1
3b5F22 / 33Fret 1
4bb7Ab21 / 11Fret 1

Full fretboard map

Every B Diminished 7 Chord chord tone across the neck, with roots highlighted for quick orientation.

Interactive

Frets 0–24. Select a position or tap a note to hear it.

GDAEFAbBDFAbBDBDFAbBDFAbFAbBDFAbBDAbBDFAbBDF123456789101112131415161718192021222324

Progression examples using B Diminished 7

Try these progressions to hear the harmony in context. On bass, outline each chord with individual target tones.

Leading-tone diminished seventh to minor

The diminished-seventh root lies a semitone below the destination tonic. Its tones come from that tonic’s harmonic minor scale.

  1. vii°7 B Diminished 7
  2. /i C Minor

Borrowed diminished seventh to major

Borrow the leading-tone diminished seventh from the destination tonic’s parallel harmonic minor, then resolve into the major chord.

  1. vii°7 B Diminished 7
  2. /I C Major

Chord Tones

DegreeIntervalNote
1RootB
b3m3D
b5d5F
bb7d7Ab

Scales Containing the Complete Formula

B Diminished (Whole-Half)

Complete Formula

1 – b3 – b5 – bb7

Compound degrees retain their names: 9, 11, and 13 are extensions. A voicing may place their pitches in a closer register.

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