Finger Positions

A#7b5/C# diagram
Root Note A#
Name A# over C#
Intervals 1P-3M-5d-7m
Relative Minor Gm
Notes C#, A#, D, E, G#
Aliases A#7b5

How to play the A#7b5/C# Chord

The A#7b5/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 A# over C# is built using the 1P, 3M, 5d, 7m intervals. In the key of A# Major, this chord functions as the I chord.

Common Progressions

In music composition, the A#7b5/C# chord is often used to create tension or resolution.

I-V-vi-IV

A# → F → Gm → D#

vi-IV-I-V

Gm → D# → A# → F

The Diatonic Family

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

Triads

A# Cm Dm D# F Gm Adim

7ths

A#maj7 Cm7 Dm7 D#maj7 F7 Gm7 Am7b5

Scale Compatibility

View All Scales
Neopolitan Major Pentatonic Whole Tone Pentatonic Lydian Dominant Pentatonic Super Locrian Pentatonic Prometheus Neopolitan Prometheus Mystery #1 Whole Tone Locrian Major Altered Lydian Dominant Leading Whole Tone Lydian Minor Hungarian Major Oriental

* 15 scales found containing the notes C#, A#, D, E, G#.

Acoustic & Digital Analysis

Digital footprint of the A#7b5/C# chord for MIDI programming and synthesizer sound design.

MIDI Numbers 61, 70, 62, 64, 68
Frequencies (Hz)

277.1826309768721, 466.1637615180899, 293.6647679174076, 329.6275569128699, 415.3046975799451