The B♭ Half-Diminished Seventh chord contains B♭, D♭, F♭, A♭. Formula: 1–♭3–♭5–♭7.
A b♭ half-diminished seventh is a diminished triad plus a minor seventh.
This spelling includes F♭. Preserve the theoretical written spelling even when an enharmonic name shares the same piano key.
Choose a position to keep the four written notes, sounding keys, bass note, playback and print reference synchronized.
B♭m7♭5 uses 1–♭3–♭5–♭7: B♭–D♭–F♭–A♭.
a diminished triad plus a minor seventh
Compared with B♭ diminished, add the minor seventh above the root.
A seventh chord has four chord tones and therefore four positions: root position plus three inversions. The slash symbol identifies the written bass note.
| Position | Symbol | Notes, low to high | Bass |
|---|---|---|---|
| Root position, current selection | B♭m7♭5 | B♭3–D♭4–F♭4–A♭4 | B♭3 |
| First inversion | B♭m7♭5/D♭ | D♭4–F♭4–A♭4–B♭4 | D♭4 |
| Second inversion | B♭m7♭5/F♭ | F♭4–A♭4–B♭4–D♭5 | F♭4 |
| Third inversion | B♭m7♭5/A♭ | A♭4–B♭4–D♭5–F♭5 | A♭4 |
No independently authorized fingering dataset is provided for N2C.
Use the written notes, keyboard positions and playback without treating the diagram as a required hand shape.
Read left- and right-hand finger numbersOpen Music Theory
Supports: seventh chords are four-note chords; major seventh, dominant seventh, minor seventh and half-diminished seventh constructions; four positions including third inversion; written spelling and inversion principles
Scope limit: Theory and spelling cross-check only; no source prose, artwork, fingering or PDF is copied.
Checked 2026-09-12 · N2C-OMT-SEVENTHOpen Music Theory
Supports: C7 dominant convention; maj7/min7/half-diminished symbol families; slash bass notation
Scope limit: Theory and spelling cross-check only; no source prose, artwork, fingering or PDF is copied.
Checked 2026-09-12 · N2C-OMT-SYMBOLSPianoChord.org
Supports: competitor family coverage; cross-check examples for major/minor seventh
Scope limit: Theory and spelling cross-check only; no source prose, artwork, fingering or PDF is copied.
Checked 2026-09-12 · N2C-PC-SEVENTHB♭, D♭, F♭, A♭.
1–♭3–♭5–♭7.
Three inversions, in addition to root position.
Select the four pitch classes that make B♭m7♭5, then check your answer.
This one-octave exercise checks the exact four-note pitch-class set. Order and inversion do not affect the result; missing and extra notes are reported, while fingering and live performance are not assessed.
One octave, C through B. Select a key again to remove it.
Chord tones: B♭–D♭–F♭–A♭ · Formula: 1, ♭3, ♭5, ♭7
Dots mark the notes to play. C4 is middle C. Numbers identify octaves, not fingers.