A#m Chord on Guitar
A#m = A# – C# – F (Root, Minor 3rd, Perfect 5th)
The E-shape minor barre for this chord lands at the sixth fret, a manageable mid-neck reach that avoids both the wide spacing near the nut and the cramped frets much higher up. In practice it's written and spoken of almost exclusively as Bb minor, following the flat-spelling convention that governs its entire harmonic neighborhood.
Bb, Db and F form the triad, and unlike several of the rarer minor barre chords elsewhere in this survey, Bb minor genuinely earns its keep in real repertoire: it's the relative minor of Db major, the second-degree chord of Ab major, and the fourth-degree chord of F minor, putting it squarely inside flat-key jazz, soul and classical writing rather than at its fringes. Because it sits at the same comfortable sixth fret as the more frequently used Bb major, and because that major triad is itself the workhorse IV chord of F-major blues, guitarists who've already built comfort with Bb major tend to pick up Bb minor almost as a byproduct, simply by learning which single finger's placement separates the two. Horn-friendly ensemble arrangements, in particular, reach for this chord regularly whenever a soul or gospel progression takes an unexpected minor-key turn.
Fingerings
Barre (6th fret)
How to Practice It
Since it shares its fret position with Bb major, the fastest way to internalize this chord is by direct comparison: hold the major triad, then adjust only the one finger responsible for the third, and listen closely to how much the color shifts from that single change. Build the barre the standard way — index finger alone first, verified string by string — before layering the ring and pinky fingers that complete the minor-seventh-free triad on top. If you're using this chord functionally, as a ii chord resolving into Ab major or a iv chord resolving into F minor, practice that specific resolution directly rather than holding the shape in isolation, since a chord's usefulness in real playing comes from how it connects to what follows. Once comfortable, try sliding the identical E-shape minor template to nearby roots to build general fluency moving this specific shape around the neck. Because it comes up often enough in real repertoire, it's also worth practicing sustaining this barre for a full four-bar phrase without releasing pressure, building the kind of static endurance a genuine soul or gospel groove built around this chord will eventually demand.
Common Progressions
- ii–V–I in Ab major: Bbm – Eb7 – Abmaj7
- iv–i in F minor: Bbm – Fm
- vi in Db major: Db – Bbm – Gb – Ab
FAQ
- Why is this chord almost always called Bb minor rather than A# minor?
- Bb minor's five-flat key signature is the standard spelling in jazz, soul and classical contexts, following the same convention as its major-key relatives Db and Ab, even though A# minor describes the identical sound.
- Is Bb minor common in guitar music?
- More common than several of the other sharp-and-flat minor chords in this survey, since it shares harmonic neighborhoods with the genuinely useful Bb major and turns up in blues, soul and jazz progressions with a minor-key turn.
- How does Bb minor relate to Bb major?
- They share the identical sixth-fret barre position, built from the E-shape template, differing only in whether the minor or major third is fretted — a small, isolated finger change separates the two.
- What key signature does Bb minor share a relative-major relationship with?
- Db major, meaning the two share an identical set of notes and key signature, differing only in which chord functions as the tonic — a relationship worth knowing if navigating flat-key jazz or soul repertoire that moves between the two.
- Is Bb minor worth learning before some of the rarer minor barre chords in this survey?
- Yes — its comfortable sixth-fret position and genuine presence in blues, soul and jazz repertoire make it a considerably better use of practice time than higher-fret, rarer cousins like C#m or D#m, which mostly function as completeness exercises rather than chords most guitarists will need often.
- Does Bb minor ever substitute for Bb major in a song originally written with the plain triad?
- Only when the substitution is intentional, since swapping a minor third for a major one is a genuine harmonic change rather than a color variation — unlike swapping a triad for its seventh-chord extension, changing major to minor alters the chord's fundamental identity and should be treated as a deliberate compositional choice, not an interchangeable simplification.
- How does Bb minor's usefulness compare to the rarer sharp-spelled minor chords covered elsewhere in this survey?
- It's considerably more practical day to day — its ties to genuinely common flat-key blues, soul and jazz repertoire mean a working guitarist is likely to need it far sooner and far more often than rarer completeness-only chords like D#m, making it worth genuine priority rather than casual, someday-eventually learning.
- Is there a good way to practice recognizing Bb minor by ear alone, without looking at the fretboard?
- Play it immediately after Bb major and focus on isolating exactly what the darker minor third adds to the sound, then try identifying that same shift the next time you hear a recording move between a major chord and its parallel minor — that specific interval change is one of the more recognizable harmonic shifts once you've trained your ear to catch it.
A#m on other instruments: A#m on Piano, A#m on Ukulele. Related: how chords are built, chord finder.