B Minor 9th Chord: Notes, Voicings, and How to Play It

Bm7 is nearly free on this instrument and it pays for that with a flaw its own shape cannot mend. In x20202 the second string rings B, a root the fifth string is already sounding, and the seventh sits underneath the doubling instead of on top of it. Press that string down to fret 2 and the surplus root becomes C♯.

x20222 is the result, and it is Bm9: B, D, F♯, A and C♯ on five strings, nothing doubled and nothing left out. The ninth here is less an addition than a repair, and it costs almost nothing, because the fourth string keeps ringing: the minor third of this root is D, which the guitar hands you free.

Try It: Bm9 in the Chord Finder

The Notes of Bm9

Two accidentals, F♯ and C♯, and they are precisely the key signature of D major and of B minor. Write this chord into either key and not one accidental appears on the page, which is why a chord of five notes can look so plain in a folk or country chart.

How Bm9 Is Built

Put C♯ on top of the minor seventh. Nothing below it moves, and since that chord had no tension in it to begin with, the ninth is pure colour rather than pressure.

The four notes above the root spell D, F♯, A and C♯, which is a D major seventh in root position, so Bm9 is that chord with a B underneath. Most of what follows comes out of that one fact. Drop the ninth a semitone to C instead and you have Bm7♭9, which belongs to B Phrygian and to little else.

Bm9 on the Piano

Three white keys and two black, and they alternate. Right hand, 1 on D, 2 on F♯, 3 on A, 5 on C♯, with the left hand holding B alone. The thumb starts at the front of the keyboard, the index goes back to a black key, the middle comes forward again and the little finger goes back, so the hand rocks in and out twice across the shape. The span from D to C♯ is a major seventh, wide but even, and the only awkward moment is the little finger reaching back onto a raised key.

There is a shortcut past the counting. Play a D major seventh in the right hand and one B below it in the left. Since that is among the first four note shapes anyone learns, the sixth degree of D major arrives years early.

Arpeggiate all five and a scale appears: B, C♯, D, F♯ and A is B minor pentatonic with its fourth degree, E, exchanged for C♯. Both work over the chord, since a minor chord takes an eleventh without complaint, but the exchange is audible. E pulls a line towards blues phrasing and C♯ pulls it firmly away.

Bm9 on the Guitar

x20222: fifth string at fret 2 for B, fourth string open for D, then the third, second and first all at fret 2 for A, C♯ and F♯. Either lay the ring finger flat across those top three with its tip clear of the open fourth string, or take one finger per string. Low to high it sounds B, D, A, C♯, F♯.

Three of the six open strings are notes of this chord, A, D and B, which is more than either B9 or Bmaj9 can manage on this root, and the grip above spends only one of them. Move the third string finger back a fret and A becomes G♯, giving Bm6: the same first position family, one fret apart.

Trim it to x2022x and the top string goes with the fifth, leaving root, third, seventh and ninth on four adjacent strings with C♯ on top, the version that comps cleanly behind a singer. Drop the fifth string instead and xx0222 is a plain D major seventh: one finger at fret 2 is the entire distance between the tonic of D major and its sixth degree.

At the seventh fret, 7x7779 is one barre across fret 7 taking the sixth, fourth, third and second strings, with the little finger on the first at fret 9. It sounds B, A, D, F♯, C♯. The fifth string is muted deliberately. Adding F♯ at fret 9 gives 797779 and a fuller bass, at the price of stretching the ring and little fingers to opposite ends of one fret.

Inversions

With five notes, what a player chooses is a bass note and a subset rather than an inversion, and one row here matters more than the rest. Put D at the bottom and the same five pitches read as D major’s tonic seventh with a thirteenth on top. Everything the numeral vi is meant to convey about that key is inside the swap, and a bass player can make it happen without anybody above moving a finger.

The fourth inversion barely counts as one. With C♯ underneath, the root sits a minor seventh above the bass and stops sounding like a root at all, so the ear hears a chord built on C♯ rather than a rearrangement of this one.

Voicings

Take the root out and xx0222 stands on its own as a rootless voicing: third, seventh, ninth and fifth, one open string among them, and a bass or a left hand supplies B. D and A carry the identity between them, one saying minor and the other saying seventh, so those two plus C♯ over a low B leave nothing in doubt.

The interval to watch is B against C♯: a whole tone is fine at the top of a voicing and thick at the bottom, which is the low register rule in a particular place. x20222 handles it by accident, landing C♯ an octave and a whole tone clear of the bass.

Which Keys Contain Bm9

• degree 1 (I) of B natural minor
• degree 1 (I) of B dorian
• degree 6 (VI) of D major
• degree 2 (II) of A major
• degree 4 (IV) of F♯ harmonic minor
• degree 3 (III) of G lydian

The ninth settles half a question the seventh leaves open. Bm7 is the tonic seventh of B natural minor, B Dorian and B Phrygian alike. Phrygian’s second degree is C natural, so C♯ rules it out at once, and what survives is the first two entries here, which disagree only over a sixth degree this chord does not contain.

Rows three and four are two sharps seen twice. D major’s sixth degree is B and A major’s second degree is B, and neither key needs an accidental beyond F♯ and C♯ to build the chord, so this is the vi9 of one and the ii9 of the other with nothing altered.

The harmonic minor entry is quieter than it looks. F♯ harmonic minor raises its seventh degree to E♯, and no E of any kind is in this chord, so the fourth degree comes through the alteration untouched.

Where Bm9 Shows Up

The first row is a trick the tuning makes almost too easy. Hold x20222 and let the open sixth string sound too. 020222 puts E under the identical five notes, and against that bass they become fifth, seventh, ninth, eleventh and thirteenth: E11, with no third in it. A ii to V in A major then needs no left hand movement at all, only a decision about which string the pick starts on.

The second row is structural rather than decorative. Bm9 to C♯7 holds B and C♯ across the change while everything else moves, and the arrival on F♯ minor is stronger for the two voices that refused to budge. Classical and flamenco writing both put a ninth on the iv there.

Row three uses the grip as colour. Add the sixth string at fret 3 and 320222 sounds G, B, D, A, C♯, F♯: a G major seventh with a ninth and a sharp eleventh, the whole G Lydian sound in one shape. The C♯ that was a mild ninth over B is the note that defines the mode over G.

Row four is where most listeners meet the chord. Because the upper four notes are D major’s tonic seventh, the pair deepens rather than changes, which songwriters use when a verse should move without announcing it. That is also the warning: if the sixth degree has to land as a real change of harmony, use the plain triad.

Related Chords

• B Minor 7th Chord
• B Minor Chord
• B Minor 6th Chord
• D Major 7th Chord
• B Dorian Scale
• Guitar Chord Shapes: The CAGED System

Learn More

• Extended Chords and Jazz Harmony
• Seventh Chords: The Complete Guide
• Diatonic Chords: A Beginner’s Guide
• Chord Inversions and Voice Leading
• The Circle of Fifths Explained