B Minor Major Seventh chord (Bmmaj7) on the guitar fretboard

The B Minor Major Seventh chord (Bmmaj7) is made of B (the root), D (minor third), F# (perfect fifth) and A# (major seventh). The fretboard shows every one of them across the neck in standard tuning (E A D G B E), and plays them back so you can hear the chord.

The minor major seventh joins a minor triad to a major seventh, an unusual pairing of a dark middle and a bright top. Its four notes repeat across the neck like any other seventh chord, with the root and seventh sitting a semitone apart. Lower the seventh by a semitone and you are back at the minor seventh.