B♭ Minor-Major Seventh Chord

Chord Tones: B♭ Minor-Major Seventh Chord

Symbol: mMaj7, m△7 — Formula: 1-♭3-5-7

Chord Notation

Roman numeral (e.g. I, IV, V) and Nashville Number notation are key-dependent. See Keys pages for chord function within specific keys.

Inversions

Harmonic Function

The B♭ minor major seventh chord commonly functions as the subtonic (♭VII) in C major or subdominant in F major. Its harmonic role varies by key — in major keys it provides subdominant or supertonic color.

The minor-major seventh chord combines a minor triad with a major seventh, creating a uniquely tense sound. It appears in descending bass lines and is characteristic of film noir and jazz. The B♭ Minor-Major Seventh Chord specifically contains 4 notes: B♭, D♭, F, A (formula: 1-♭3-5-7). On piano, Bb-rooted chords start on a black key and create hand shapes that jazz pianists find ideal for voicing seventh chords and extended harmonies. Jazz standards, swing, and big band charts are heavily weighted toward Bb because it allows horn sections to play in their most comfortable range.

Common Progressions

The B♭ Minor-Major Seventh Chord frequently appears in these progression patterns (shown in Roman numeral notation relative to key):

• i-imaj7-i7-iv

Songs Featuring the Minor-Major Seventh Chord

Well-known songs where the B♭ Minor-Major Seventh Chord — or this chord type — plays a prominent role:

• Cry Me a River – Julie London
• James Bond Theme – John Barry
• Willow Weep for Me – jazz standard

Tuning Frequencies Across Temperaments

Frequencies shown at A=440 Hz. View full temperament data for any note.

Scales Containing the B♭ Minor-Major Seventh Chord

These scales include the B♭ Minor-Major Seventh Chord as a diatonic or characteristic chord: