Root, third and seventh: the guide tones fix the quality, so the fifth is dropped. That is what leaves a string free, so pick a tension to put on top.
Bmaj7 is B, D#, F# and A# — B with the major seventh added on top.
It sounds lush, and only just resolved. The everyday tonic of jazz, bossa and neo-soul.

| B | D# | F# | A# |
|---|---|---|---|
| 1 | 3 | 5 | 7 |
Tonic — a resting chord, but a soft one.
Also written BM7, BΔ7, BΔ, Bma7 or B major 7. The same chord either way; which spelling you meet depends on who wrote the chart.
Root, third and seventh. The third and seventh, the guide tones, are what make the chord major, minor or dominant, so the fifth can go: it says nothing the symbol needs.
Three notes means a spare string, which is the real point. Put a tension on it.
Bmaj7 has 5 of them, on the low-middle three, the bottom three strings, strings 5-3-2 and strings 6-4-3, from open position up to the 13th — all in one inversion, so the bass note never moves. The one to learn first is the B shape at the nut, which is the easiest grip here.
Start with xxx446 — no barre and only 3 fretted notes. None of the shapes for Bmaj7 uses an open string, so every one of them is movable; the lowest sits at the 2nd fret. 4 of the 7 need a barre. Together they cover the neck from the 2nd fret to the 15th.
| Frets | Where | Bass | Top | Hand |
|---|---|---|---|---|
| x24342 | 2nd fret | B, root position | F# | all fretted |
| xxx446 | 4th fret | B, root position | A# | all fretted |
| xx4446 | 4th fret | F#, 2nd inversion | A# | barred |
| 798877 | 7th fret | B, root position | B | barred |
| x-x-9-11-11-11 | 9th fret | B, root position | D# | barred |
| x-14-13-11-11-11 | 11th fret | B, root position | D# | barred |
| x-14-13-15-12-x | 12th fret | B, root position | B | all fretted |
The same notes rebuilt from scratch give 14 drop 2 and 9 drop 3 voicings, each on its own page.
Tensions. A shell of Bmaj7, root, third and seventh, leaves a string free, and the tones that belong over it are the 9 (C#), the #11 (E#) and the 13 (G#).
How you get to it. The turn that lands on Bmaj7 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 Bmaj7 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 Bmaj7 is in B major and B lydian.
Change one note of Bmaj7 and you have B (drop the major seventh), Bmaj7b5 (the fifth becomes a flat fifth), Bmaj7#5 (the fifth becomes a sharp fifth), Bmaj9 (add the ninth), BmMaj7 (the major third becomes a minor third) or Badd9 (the major seventh becomes a ninth).
Bmaj7 is a major chord — root, major third, fifth. Major chords on every root.
On Bmaj7’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.