Finger Positions

Root Note C#

Name C# over F

Intervals 1P-3m-6m-7m

Relative Minor A#m

Notes F, C#, E, A, B

Aliases C#m7#5

How to play the C#m7#5/F Chord

The C#m7#5/F 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 C# over F is built using the 1P, 3m, 6m, 7m intervals. In the key of C# Major, this chord functions as the I chord.

Common Progressions

In music composition, the C#m7#5/F chord is often used to create tension or resolution.

I-V-vi-IV

C# → G# → A#m → F#

vi-IV-I-V

A#m → F# → C# → G#

The Diatonic Family

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

Triads

C# D#m Fm F# G# A#m Cdim

7ths

C#maj7 D#m7 Fm7 F#maj7 G#7 A#m7 Cm7b5

Scale Compatibility

View All Scales

Minor Phrygian Locrian Malkos Raga Altered Locrian #2 Spanish Heptatonic Bebop Locrian Minor Bebop Messiaen's Mode #3 Chromatic

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

Acoustic & Digital Analysis

Digital footprint of the C#m7#5/F chord for MIDI programming and synthesizer sound design.

MIDI Numbers 65, 61, 64, 69, 71

Frequencies (Hz)

349.2282314330039, 277.1826309768721, 329.6275569128699, 440, 493.8833012561241