B♭ minor-major 7th chord

Playing it

There’s no open-string way to play B♭m(maj7) on guitar with the root in the bass, so the standard shape is a barre across the 1st fret (x13221).

On piano, B♭m(maj7) has two black keys (B♭ and D♭) and two white keys.

On ukulele the usual B♭m(maj7) shape is 3110, using three fingers.

Related chords

Take away the root and the other three notes form D♭aug (D♭ F A) — so you can think of B♭m(maj7) as D♭aug with B♭ added underneath.

Move a single note and B♭m(maj7) becomes a different chord: drop the A for B♭m, raise D♭ to D for B♭maj7, lower A to A♭ for B♭m7 and swap A for G for B♭m6.