Bb Guitar Chord
Bb Major · also written A# · Bb–D–F
Bb is the Bb major chord: Bb–D–F. Its sound is bright and resolved — the foundational happy sound of pop, rock, country, and folk. It's also written as A# — same notes, same shapes, different spelling.
You'll meet Bb constantly because it lives in several common keys: it's the I chord in Bb major, the IV chord in F major, and the V chord in Eb major. That makes it a building block of I–IV–V and I–V–vi–IV progressions in those keys.
The most common way to play Bb is the a-shape barre at the 1st fret (x 1 3 3 3 1, low E string to high E string). Below you'll find 8 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 Bb: 8 Voicings
Frets are listed from the low E string to the high E string. x = don't play that string, 0 = open string.
Bb Chord Theory
| Interval | R | 3 | 5 |
|---|---|---|---|
| Note | Bb | D | F |
Bb is built from the Bb major scale.
Bb Chord FAQ
What notes are in the Bb chord?
Bb contains 3 notes: Bb (R), D (3), F (5). The interval formula for a major chord is R–3–5.
What is the easiest way to play Bb on guitar?
Use the a-shape barre at the 1st fret: x 1 3 3 3 1 (frets listed from the low E string to the high E string, x = don't play that string). Bb has no open-position shape in standard tuning, so this movable form is the standard starting point.
What is the difference between Bb and Bbm?
One note: the 3rd. Bb major uses the major 3rd (D) while Bb minor flattens it to Db. That half-step is the entire difference between the bright major sound and the darker minor sound.
Is Bb the same as A#?
Yes. Bb and A# are enharmonic equivalents — the same pitch written two ways. Bb and A# use identical shapes and frets; which spelling you see depends on the key of the song.
What keys use the Bb chord?
Bb 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
Hear yourself play Bb
OpenFret listens to your real guitar through the microphone. Check your chords ring clean in the free Studio, or learn the fretboard by battling monsters in Guitar Quest — free in your browser, no signup needed.