Finger Positions

Root Note A#

Name A# diminished seventh over C

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

Relative Minor Gm

Notes C, A#, C#, E, G

Aliases A#dim7, A#°7, A#o7

How to play the A#dim7/C Chord

The A#dim7/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# diminished seventh over C is built using the 1P, 3m, 5d, 7d intervals. In the key of A# Major, this chord functions as the I chord.

Common Progressions

In music composition, the A#dim7/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

Diminished Ultralocrian Locrian 6 Dorian #4 Lydian Diminished Hungarian Major Lydian #9 Half-Whole Diminished Composite Blues Messiaen's Mode #7 Chromatic

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

Acoustic & Digital Analysis

Digital footprint of the A#dim7/C chord for MIDI programming and synthesizer sound design.

MIDI Numbers 60, 70, 61, 64, 67

Frequencies (Hz)

261.6255653005986, 466.1637615180899, 277.1826309768721, 329.6275569128699, 391.99543598174927