Finger Positions

Root Note C#

Name C# over B

Intervals 1P-3M-5P-6M-11A

Relative Minor A#m

Notes B, C#, F, G#, A#, G

Aliases C#M6#11, C#M6b5, C#6#11, C#6b5

How to play the C#6b5/B Chord

The C#6b5/B is a fundamental major 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 B is built using the 1P, 3M, 5P, 6M, 11A intervals. In the key of C# Major, this chord functions as the I chord.

Common Progressions

In music composition, the C#6b5/B 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

Lydian Lydian Dominant Hungarian Major Lydian #9 Ichikosucho Half-Whole Diminished Composite Blues Chromatic

* 8 scales found containing the notes B, C#, F, G#, A#, G.

Acoustic & Digital Analysis

Digital footprint of the C#6b5/B chord for MIDI programming and synthesizer sound design.

MIDI Numbers 71, 61, 65, 68, 70, 67

Frequencies (Hz)

493.8833012561241, 277.1826309768721, 349.2282314330039, 415.3046975799451, 466.1637615180899, 391.99543598174927