The standard grips this chord is usually shown with.
Bmaj9 is B, D#, F#, A# and C# — Bmaj7 with the ninth stacked above it.
It sounds a maj7 with more air in it. The ninth argues with nothing here, so it works anywhere a maj7 does.

| B | D# | F# | A# | C# |
|---|---|---|---|---|
| 1 | 3 | 5 | 7 | 9 |
Tonic — an extended resting chord.
Also written BM9, BΔ9, Bma9 or B major 9. The same chord either way; which spelling you meet depends on who wrote the chart.
Bmaj9 in 2nd inversion puts F# in the bass instead of B, the 5th of the chord. The notes are the same; what changes is what the bass line does, which is most of why you would reach for it — it lets the lowest voice move by step where the root would have jumped.
2 of Bmaj9’s 12 common shapes do this: 22132x, xx4646.
Start with x2132x — no barre and down at the nut. None of the shapes for Bmaj9 uses an open string, so every one of them is movable; the lowest sits at the 1st fret. 6 of the 12 need a barre. Together they cover the neck from the 1st fret to the 15th.
| Frets | Where | Bass | Top | Hand |
|---|---|---|---|---|
| x2132x | 1st fret | B, root position | C# | all fretted |
| 22132x | 1st fret | F#, 2nd inversion | C# | barred |
| x44446 | 4th fret | C#, 9th in the bass | A# | barred |
| xx4646 | 4th fret | F#, 2nd inversion | A# | all fretted |
| 744446 | 4th fret | B, root position | A# | barred |
| 768676 | 6th fret | B, root position | A# | barred |
| 798879 | 7th fret | B, root position | C# | all fretted |
| xx8879 | 7th fret | A#, 3rd inversion | C# | all fretted |
| x-x-9-8-11-9 | 8th fret | B, root position | C# | all fretted |
| 11-9-9-11-11-9 | 9th fret | D#, 1st inversion | C# | barred |
| x-14-11-11-11-11 | 11th fret | B, root position | D# | barred |
| x-14-13-15-14-x | 13th fret | B, root position | C# | all fretted |
The same notes rebuilt from scratch give 4 shell, 13 drop 2, 8 drop 3 and 13 rootless voicings, each on its own page.
Tensions. A shell of Bmaj9, root, third and seventh, leaves a string free, and the tones that belong over it are the #11 (E#) and the 13 (G#).
How you get to it. The turn that lands on Bmaj9 is C#m7 to F#7 — the ii and the V of B — and F#7 shares its third and seventh with C#m7, so the hand barely moves between them.
In which keys. Every note of Bmaj9 belongs to Eb minor (the ♭VI), F# major (the IV, the subdominant), Ab minor (the ♭III) and B major (the I, the tonic).
Every note of Bmaj9 is in B major and B lydian.
Change one note of Bmaj9 and you have Bmaj7 (drop the ninth), Bmaj11 (add the fourth), Bmaj13 (add the sixth), BmMaj9 (the major third becomes a minor third), Badd9 (drop the major seventh) or B69 (the major seventh becomes a sixth).
Bmaj9 is a major chord — root, major third, fifth. Major chords on every root.
On Bmaj9’s sound and use this page follows Mark Levine, The Jazz Theory Book (Sher Music, 1995). The shapes and the derived voicings come from different places, and both are explained in where the chords and the theory come from.
Shows each chord the way this style would voice it, and marks which of its alternatives belong to the idiom.