Chord Detail
B♭ Dominant Thirteenth Chord
Bb13 is a Bb dominant thirteenth chord — the fully extended dominant chord spanning every third from root to thirteenth. Rich, full, and soulful, it is the crown jewel of dominant harmony in jazz and gospel.
The dominant thirteenth chord is the complete dominant stack: root, major third (D), perfect fifth, minor seventh, major ninth, perfect eleventh, and major thirteenth. Bb13 uses Bb, D, F, Ab, C, Eb, G. The thirteenth (major sixth an octave higher) provides a bright, warm color that sits on top of the full dominant stack. In jazz, the thirteenth chord is voiced selectively — typically root, third, flat-seventh, and thirteenth — to capture the chord's essential character without muddiness. The thirteenth itself is often the melody note over a V chord, giving that warm "jazz ending" sound. In gospel, the V13 chord creates maximum harmonic richness before resolving to the tonic.
Formula: 1 – 3 – 5 – ♭7 – 9 – 11 – 13
1Root0 semitones3Major Third4 semitones5Perfect Fifth7 semitones♭7Minor Seventh10 semitones9Major Ninth14 semitones11Perfect Eleventh17 semitones13Major Thirteenth21 semitonesFull, rich, warm, complete, and soulful. The complete dominant stack — the most harmonically saturated chord in common use.
Dominant seventh chords are the harmonic engine that drives music forward. Their combination of major third and minor seventh creates tension that pulls powerfully toward the tonic — making them the most directional chord in Western music.
⚡ Other tense sounds to explore
Never play all seven notes of a thirteenth chord simultaneously — it becomes muddy. Instead, select key tones: root, third, flat-seventh, and thirteenth for the essential sound. Or: root, flat-seventh, ninth, thirteenth. In jazz, rootless voicings are common: third–flat-seventh–ninth–thirteenth in the right hand over the root in the bass.
iim9 – V13 – Imaj7 (Full jazz ii–V–I)V13 – Imaj9 (Rich resolution)I13 – IV9 – V13 – I (Jazz blues)IIIm7 – VI13 – IIm7 – V13 (Turnaround)Function
Dominant
Tense / Directional
Most active chord in tonal harmony — tritone creates strong pull toward the tonic.
Bb13 is the V7 chord in the key of E♭ major — containing a tritone between its major third and minor seventh that creates the strongest harmonic pull in tonal music. This tension resolves powerfully up a perfect fourth to E♭, making Bb13 one of the most directional chords in Western harmony.
Found in these progressions
Scales that naturally contain the Bb13 chord:
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