A# Chord on Guitar
A# = A# – D – F (Root, Major 3rd, Perfect 5th)
A# major sits at the sixth fret as a full six-string E-shape barre, a comfortable mid-neck position with moderate fret spacing — noticeably easier to reach than the ninth- or eleventh-fret barres its sharp-key cousins C# and D# major need. It's almost universally called Bb major in practice, since the two-flat spelling is standard across the blues, soul, funk and classical wind repertoire where this key shows up constantly.
A#, D and F (more conventionally Bb, D and F) make up the triad. Bb major is one of the more genuinely useful chords in this whole survey of harder barre positions, since it's a favorite key for horn-friendly music (B-flat trumpets, clarinets and tenor saxophones all read comfortably in it) and a common resolution point in blues turnarounds and twelve-bar forms in the key of F, where Bb functions as the IV chord. Its relative minor is G minor, and as a home key in its own right, two-flat Bb major has real classical pedigree as well. Because the sixth fret sits at such a manageable position, Bb major is arguably the most approachable of the less-guitar-typical flat-key barre chords, making it worth prioritizing over some of its rarer sharp-spelled neighbors.
Fingerings
Barre (6th fret)
How to Practice It
Treat this chord as genuinely worth memorizing solidly, unlike some of the rarer roots in this survey, given how often Bb turns up as the IV chord in F-major blues and soul progressions. Isolate the barre alone first at the sixth fret, checking all six strings ring clean before adding the other three fingers, exactly the same build-up approach that works for any barre chord. Practice the specific Bb-to-Eb transition, since that IV-to-bVII-style motion (or, in blues terms, the turnaround through the subdominant) appears constantly in horn-influenced rhythm guitar parts. Compare this sixth-fret shape directly against F#7 two frets below (from elsewhere in this survey) to notice how similar the physical demand is regardless of root name, reinforcing that barre difficulty tracks fret position rather than which chord is being played. Once the plain triad feels secure, practice adding and removing the flat seventh (turning this into Bb7) as a quick finger-independence drill, since that specific major-to-dominant-seventh conversion is one of the most commonly needed on-the-fly adjustments in blues and soul rhythm playing.
Common Progressions
- I–IV–V in Bb major: Bb – Eb – F
- IV chord in F major blues: F7 – Bb7 – C7 (Bb as the plain triad's dominant-seventh cousin)
- vi–I: Gm – Bb (G minor's relative major resolving up to Bb)
FAQ
- Why is this chord almost always called Bb rather than A#?
- Bb major's two-flat key signature is standard in blues, soul, funk and classical wind writing, since it suits common transposing instruments naturally — A# would require an awkward spelling for the identical sound.
- Is Bb major hard to play as a barre chord?
- It's one of the more comfortable non-open barre chords, sitting at the sixth fret where the fret spacing is moderate — noticeably easier than the ninth- or eleventh-fret barres needed for its sharp-key cousins C# and D# major.
- Why does Bb major matter for blues guitarists?
- It's the IV chord of a standard twelve-bar blues progression in the key of F, one of the most common blues keys, making Bb a genuinely frequent chord despite requiring a barre rather than an open-string shape.
- What key is Bb major's relative minor?
- G minor, itself a barre-only chord with no comfortable open-string form, meaning the whole Bb/Gm neighborhood of keys sits outside guitar's naturally sharp-key-friendly open strings.
- Is Bb major a chord worth prioritizing over the other flat-key majors in this survey?
- Generally yes — its central role in F-major blues and its comfortable sixth-fret position make it considerably more useful in everyday playing than rarer, higher-fret cousins like C# or D# major, so it's a reasonable one to focus on first if learning this whole family gradually.
- Do horn players and guitarists typically read this chord the same way?
- Broadly yes for concert-pitch instruments, though B-flat transposing instruments like trumpet or clarinet will read and finger an entirely different notated pitch to sound the same Bb a guitarist plays, a distinction worth knowing if you're ever handed a chart written for a transposing instrument instead of guitar.
- Is Bb major ever played higher up the neck instead of at the sixth fret?
- Yes — the identical E-shape barre reappears an octave higher at the eighteenth fret, though that position is rarely practical for rhythm playing and shows up more in lead or chord-melody contexts where a brighter, higher-register voicing is specifically wanted.
- Does knowing Bb major help with any other commonly needed chords?
- Yes — since it shares its barre position and hand shape with both Bb minor and Bb7, all covered elsewhere in this chord library, solidifying this one triad gives a genuine head start on two closely related chords built from the identical sixth-fret position.
- Is there a quick way to check if a Bb major barre is buzzing on just one string?
- Play through the chord one string at a time from low to high immediately after strumming, listening for the specific string that sounds muted or buzzy — isolating the problem this way is faster than guessing and re-fretting the entire barre repeatedly.
A# on other instruments: A# on Piano, A# on Ukulele. Related: how chords are built, chord finder.