B♭ Augmented Chord

Bbaug Level 5: The Abyss

B♭ Augmented (Bbaug) is built from the notes Bb, D, F#. Its intervals are Root — Major 3rd — Augmented 5th. Dreamlike, floating, and unresolved. The augmented triad sounds like it's suspended in mid-air — neither tense nor relaxed, just hovering.

Hear B♭ Augmented Chord

Piano sample · tap to play

Notes and intervals

Interval Semitones Note
Root 0 Bb
Major 3rd 4 D
Augmented 5th 8 F#

What does b♭ augmented chord sound like?

Dreamlike, floating, and unresolved. The augmented triad sounds like it's suspended in mid-air — neither tense nor relaxed, just hovering.

B♭ Augmented Chord in music

A wide, floating chord (Bb-D-F#) that bridges flat and sharp key areas. Used in chromatic modulations and jazz reharmonisation.

How to recognise b♭ augmented chord by ear

Augmented sounds "stretched." Both intervals are major thirds, creating a wide, evenly-spaced structure. If a chord feels dreamy and weightless — like the ground has disappeared — that's augmented.

Practice identifying this chord in ChordFrog's Level 5: The Abyss .

Practice tip

Bb augmented (Bb-D-F#) is unusual because it bridges flat-key territory (Bb) with sharp-key territory (F#). This cross-key character makes it an effective modulation device. Practise hearing how the F# pulls the ear away from the flat world of Bb.

Frequently asked questions

What notes are in a B♭ Augmented chord?
B♭ Augmented (Bbaug) contains three notes: Bb, D, F#. The intervals are Root, Major 3rd, Augmented 5th.
How do I recognise B♭ Augmented by ear?
Augmented sounds "stretched." Both intervals are major thirds, creating a wide, evenly-spaced structure. If a chord feels dreamy and weightless — like the ground has disappeared — that's augmented. Practice identifying B♭ Augmented in ChordFrog's Level 5 (The Abyss).
What level is B♭ Augmented in ChordFrog?
B♭ Augmented is introduced at Level 5: The Abyss. This is the final level, adding diminished and augmented triads for the complete chord vocabulary.

Other Bb chords

B♭ Major Chord B♭ Minor Chord B♭ Diminished Chord B♭ Sus2 Chord B♭ Sus4 Chord

All Augmented Chords chords

C Augmented Chord D♭ Augmented Chord D Augmented Chord E♭ Augmented Chord E Augmented Chord F Augmented Chord F♯ Augmented Chord G Augmented Chord A♭ Augmented Chord A Augmented Chord B Augmented Chord

Hear b♭ augmented chord for yourself

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