Bbaug Guitar Chord
Bb Augmented · also written A#aug · Bb–D–F#
Bbaug is the Bb augmented chord: Bb–D–F#. Its sound is dreamlike and unsettled — the raised 5th makes it float, perfect for transitions. It's also written as A#aug — same notes, same shapes, different spelling.
Bbaug raises the 5th of Bb major by a half-step, splitting the octave into equal major 3rds. Like the diminished chord it's symmetrical — the same shape three frets up spells another augmented chord. Songwriters use it to lift from I toward IV or vi (think the intro of "Oh! Darling").
The most common way to play Bbaug is the augmented grip at the 6th fret (6 x 8 7 7 6, low E string to high E string). Below you'll find 3 ways to play it across the neck, from open position to barre and shell voicings, with the theory behind the chord and the progressions it lives in.
How to Play Bbaug: 3 Voicings
Frets are listed from the low E string to the high E string. x = don't play that string, 0 = open string.
Bbaug Chord Theory
| Interval | R | 3 | #5 |
|---|---|---|---|
| Note | Bb | D | F# |
Bbaug is built from the Bb major scale.
Bbaug Chord FAQ
What notes are in the Bbaug chord?
Bbaug contains 3 notes: Bb (R), D (3), F# (#5). The interval formula for a augmented chord is R–3–#5.
What is the easiest way to play Bbaug on guitar?
Use the augmented grip at the 6th fret: 6 x 8 7 7 6 (frets listed from the low E string to the high E string, x = don't play that string). Bbaug has no open-position shape in standard tuning, so this movable form is the standard starting point.
Is Bbaug a major or minor chord?
Bbaug is built on a major triad (Bb–D–F#) with the #5 added, so it behaves as a major-family chord.
Is Bbaug the same as A#aug?
Yes. Bb and A# are enharmonic equivalents — the same pitch written two ways. Bbaug and A#aug use identical shapes and frets; which spelling you see depends on the key of the song.
What keys use the Bbaug chord?
Bbaug appears diatonically in Bb major (as I), F major (as IV), and Eb major (as V) — plus G minor, its relative minor key.
Related Chords
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