This chord is played start on fret 7 Minor seventh chord with added 13th (6th). Most of the time the 5th is left out (3rd note). The 13th = 6th 13th is used when the chord is a 7th chord with added 6th 6th chords are not 7th chords with added 6th.
Scale structure: R-m3-5-m7-13
Note: B D Gb A Ab
Alternative names: Bminor13, Bmin13, Bm7/13, Bm7(add13), B-7(add13), B-7/13, Bmin7/13, Bmin7(add13), Bm7/6, Bm7(add6), B-7(add6), B-7/6, Bmin7/6, Bmin7(add6)
Importance: Rarely used