Finger Positions

Root Note A

Name A half-diminished over C

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

Relative Minor F#m

Notes A, C, Eb, G

Aliases Am7b5, Aø, A-7b5, Ah7, Ah

How to play the Am7b5/C Chord

The Am7b5/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 half-diminished 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 Am7b5/C chord is often used to create tension or resolution.

I-V-vi-IV

A → E → F#m → D

vi-IV-I-V

F#m → D → A → E

The Diatonic Family

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

Triads

A Bm C#m D E F#m G#dim

7ths

Amaj7 Bm7 C#m7 Dmaj7 E7 F#m7 G#m7b5

Scale Compatibility

View All Scales

Minor Blues Locrian Locrian Pentatonic Super Locrian Pentatonic Altered Locrian #2 Locrian 6 Dorian #4 Hungarian Major Flamenco Bebop Locrian Half-Whole Diminished Composite Blues Messiaen's Mode #3 Chromatic

* 15 scales found containing the notes A, C, Eb, G.

Acoustic & Digital Analysis

Digital footprint of the Am7b5/C chord for MIDI programming and synthesizer sound design.

MIDI Numbers 69, 60, 63, 67

Frequencies (Hz)

440, 261.6255653005986, 311.1269837220809, 391.99543598174927