F diminished major 7th chord on ukulele (FdimMaj7)

Why it sounds like that

F diminished major 7th is built from the formula 1, ♭3, ♭5, 7. The diminished 5th between F and C♭ gives the chord its tense, unstable quality. The major 7th E acts as a leading tone back to F. Compare with F minor 7th flat 5th, which has a minor 7th instead.

What goes wrong with F diminished major 7th?

• The pinky on the C string may collapse and mute the E string.
• The ring finger on the A string can touch the E string, deadening its note.
• The index finger on the G string may accidentally mute the C string.

When to use it

F diminished major 7th works as a passing chord in F minor progressions, such as Fm–FdimM7–Fm7. Its tense sound suits jazz, gypsy jazz, and dramatic ballads. Use it to lead into F minor or F major.

Changing to and from F diminished major 7th

• Sliding the shape up one fret to the 2nd fret gives F♯ diminished major 7th.
• Sliding the shape up two frets to the 3rd fret gives G diminished major 7th.

Which voicing to use

The default FdimM7/E inversion places E in the bass, making the chord feel unresolved and pulling toward F. The 4th fret position has F in the bass, giving a more grounded root-position sound.