Finger Positions

Root Note F#

Name F# diminished seventh over C

Intervals 1P-3m-5d-7d

Relative Minor D#m

Notes F#, A, C, Eb

Aliases F#dim7, F#°7, F#o7

How to play the F#dim7/C Chord

The F#dim7/C is a fundamental dominant chord in guitar music. To play this chord correctly, ensure your fingers are placed precisely on the frets indicated in the diagram above.

Music Theory Analysis

From a theoretical perspective, the F# diminished seventh over C is built using the 1P, 3m, 5d, 7d intervals. In the key of F# Major, this chord functions as the I chord.

Common Progressions

In music composition, the F#dim7/C chord is often used to create tension or resolution.

I-V-vi-IV

F# → C# → D#m → B

vi-IV-I-V

D#m → B → F# → C#

The Diatonic Family

Understanding the "family" of chords that belong to F# helps with transposition and ear training.

Triads

F# G#m A#m B C# D#m Fdim

7ths

F#maj7 G#m7 A#m7 Bmaj7 C#7 D#m7 Fm7b5

Scale Compatibility

View All Scales

Diminished Ultralocrian Locrian 6 Dorian #4 Lydian Diminished Hungarian Major Lydian #9 Half-Whole Diminished Composite Blues Messiaen's Mode #7 Chromatic

* 11 scales found containing the notes F#, A, C, Eb.

Acoustic & Digital Analysis

Digital footprint of the F#dim7/C chord for MIDI programming and synthesizer sound design.

MIDI Numbers 66, 69, 60, 63

Frequencies (Hz)

369.9944227116344, 440, 261.6255653005986, 311.1269837220809