Bass · diminished seventh
F♯dim7 Chord on Bass
F# Diminished 7th is F#, A, C, Eb — the 1-b3-b5-bb7 pattern of a diminished seventh chord. Here is the shape, the audio, and what usually goes wrong.
There is no open F#dim7 on bass. The one shape below sits up the neck and is rated advanced.
Start here — Root-b3-b5-bb7 Shape (1st fret)
Fingered low on the neck with no barre — a useful middle step between the open shape and the movable ones.
What beginners get wrong
Moving in and out of it
The shape above: Root-b3-b5-bb7 Shape (1st fret).
Listening: each shape above has its own play button, and each one plays the notes that shape actually produces — not a generic triad.
F#dim7 on other instruments
Same notes, different hands. Every link below is a real page with diagrams and audio.
Chords next door
Same root, different colour — and all of them playable on bass.
F#dim7 on Bass — questions people ask
What is the easiest way to play F#dim7 on bass?
“Root-b3-b5-bb7 Shape (1st fret)” — which we rate advanced — is the easiest F#dim7 shape on bass. Fingered low on the neck with no barre — a useful middle step between the open shape and the movable ones. There is no open F#dim7 on bass, so a barre is unavoidable; this is the least demanding one.
What notes are in the F# Diminished 7th chord?
F# Diminished 7th is F#, A, C, Eb — the 1-b3-b5-bb7 interval pattern of a diminished seventh chord. Every voicing on this page uses those notes and nothing else; they just appear in a different order and octave.
What can I play instead of F#dim7?
The nearest stand-ins on bass that keep the same root are F#sus4, F#sus2, F#. They keep the root and the fifth and only change what sits in the middle, so most songs still work — but check the swap against the melody, because the note you removed may be the one the tune is singing.
Can I play F#dim7 on other instruments?
Yes. F#dim7 is the same set of notes everywhere; only the fingering changes. This site has diagrams and audio for it on guitar, piano, ukulele, mandolin, banjo.
Learn the theory behind F#dim7
The shape gets your fingers there. These explain why it sounds the way it does.
Functional Harmony: Three Roles, One Engine
Diminished chords are almost always doing a job. This explains which one.
6 min read
Cadences — The Four Ways a Phrase Ends
Where all that tension goes — how the chord resolves into the next one.
4 min read
Voice Leading — Hold What You Can, Move Only What You Must
Half-steps do the work here. Voice leading is how you find them.
6 min read