Finger Positions

Root Note A#

Name A# over C

Intervals 1P-3M-5P-7m-9A-11A

Relative Minor Gm

Notes C, A#, D, F, G#, C#, E

Aliases A#7#9#11, A#7b5#9, A#7#9b5

How to play the A#7#9b5/C Chord

The A#7#9b5/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, 5P, 7m, 9A, 11A intervals. In the key of A# Major, this chord functions as the I chord.

Common Progressions

In music composition, the A#7#9b5/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

Hungarian Major Flamenco Half-Whole Diminished Composite Blues Messiaen's Mode #3 Chromatic

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

Acoustic & Digital Analysis

Digital footprint of the A#7#9b5/C chord for MIDI programming and synthesizer sound design.

MIDI Numbers 60, 70, 62, 65, 68, 61, 64

Frequencies (Hz)

261.6255653005986, 466.1637615180899, 293.6647679174076, 349.2282314330039, 415.3046975799451, 277.1826309768721, 329.6275569128699