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B♭ 13sus4

Also known as A♯ 13sus4
Same keys, different spelling.
Open A♯ 13sus4 →Same chord, spelled with sharpsWhat are enharmonics? →Why one chord has two names
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Listen plays the chord. Play Along lights up each note in order so you can follow.

B♭13sus4
B♭ – E♭ – F – A♭ – C – G
Formula:R-P4-P5-m7-M9-M13
Intervals:P1-P4-P5-m7-M9-M13
Scale Degrees:1-4-5-b7-9-13

Introduction

Bb 13sus4 piano chord, root position — Bb, Eb, F, Ab, C, G
The Bb 13sus4 chord in root position on a piano keyboard, notes Bb, Eb, F, Ab, C, G.

The B♭ 13sus4 chord is a six-note chord made up of B♭, E♭, F, A♭, C, and G. It is built from a root, perfect fourth, perfect fifth, minor seventh, major ninth, and major thirteenth.

Notes

Notes:B♭ – E♭ – F – A♭ – C – G

Key Signature

The key of Bb 13sus4 has 2 flats.

B♭E♭

Order of flats

Flats are added in a fixed order — the reverse of the sharp order. Each new flat key adds the next flat on the list.

B♭E♭A♭D♭G♭C♭F♭

Mnemonic: Battle Ends And Down Goes Charles’ Father

Chords in the Key of B♭ Major

These are the diatonic triads built on each degree of the B♭ major scale:

C
D
E
F
G
A
B
C
D
E
F
G
A
B
I — B♭ Major (major)
DegreeNumeralChordQuality
1IB♭ MajorMajor
2iiC MinorMinor
3iiiD MinorMinor
4IVE♭ MajorMajor
5VF MajorMajor
6viG MinorMinor
7vii°A DiminishedDiminished

Theory: Intervals

Formula: R-P4-P5-m7-M9-M13
Intervals: P1-P4-P5-m7-M9-M13

The B♭ 13sus4 is built by stacking intervals from the root note. The formula R-P4-P5-m7-M9-M13 describes the scale degrees used. The intervals P1-P4-P5-m7-M9-M13 show the distance between each note in the chord.

B♭ 13sus4 — Frequently Asked Questions

What notes are in the Bb 13sus4 chord?
The Bb 13sus4 chord (Bb13sus4) contains 6 notes: Bb, Eb, F, Ab, C, G. Formula: R-P4-P5-m7-M9-M13.
How is Bb13sus4 used in music?
Bb13sus4 is used in jazz, fusion, and contemporary music to add harmonic color. It appears as a dominant or tonic chord depending on context.
What is the scale degree formula for Bb13sus4?
Bb13sus4 uses scale degrees 1-4-5-b7-9-13, giving it its distinctive sound.

Practice Tips

  • Start by placing your thumb on Bb and spacing remaining fingers across the chord.
  • Practice Bb13sus4 slowly with separate hands before combining.
  • Listen carefully to the tension created by the altered tones in this chord.
  • Try voicing Bb13sus4 in different octaves to find the most comfortable position.
  • Resolve Bb13sus4 to a nearby chord to hear its function in context.

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