B major 13th chord

Bmaj13 chord for piano with keyboard diagram.
Explanation: The B major thirteenth is a six-note chord (the 11th, E in the case of Bmaj13, is normally excluded). For practical reasons the chord is normally played with omitted notes and/or inverted. It is often abbreviated as Bmaj13 (not to be confused with B13).
Omissions: Bmaj13(no5): B - D# - A# - C# - G#, Bmaj13(no9): B - D# - F# - A# - G#.
Theory: The B major thirteenth chord is constructed by extending the major eleventh chord with a major thirteenth note.

Bmaj13

Bmaj13 chord diagram
Notes: B - D# - F# - A# - C# - G#

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Bmaj13 inversions and voicings

Bmaj13/A# chord diagram
Notes: A# - D# - F# - G# - B
One of many possible inversions (Bmaj13/A# with the 9th and the 11th omitted)

Bmaj13 chord voicing diagram
Notes: B - A# - D# - G#
Two-hand voicing

B chord categories

B Bm B7 Bm7 Bmaj7 BmM7 B6 Bm6 B6/9 B5 B9 Bm9 Bmaj9 B11 Bm11 Bmaj11 B13 Bm13 Bmaj13 Badd B7-5 B7+5 Bsus Bdim Bdim7 Bm7b5 Baug Baug7