Finger Positions

Root Note F

Name F over A#

Intervals 1P-3M-5d-7m-9M

Relative Minor Dm

Notes A#, F, A, B, Eb, G

Aliases F9b5

How to play the F9b5/A# Chord

The F9b5/A# 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 F over A# is built using the 1P, 3M, 5d, 7m, 9M intervals. In the key of F Major, this chord functions as the I chord.

Common Progressions

In music composition, the F9b5/A# chord is often used to create tension or resolution.

I-V-vi-IV

F → C → Dm → Bb

vi-IV-I-V

Dm → Bb → F → C

The Diatonic Family

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

Triads

F Gm Am Bb C Dm Edim

7ths

Fmaj7 Gm7 Am7 Bbmaj7 C7 Dm7 Em7b5

Scale Compatibility

View All Scales

Prometheus Whole Tone Locrian Major Lydian Dominant Leading Whole Tone Lydian Minor Messiaen's Mode #6 Composite Blues Messiaen's Mode #3 Chromatic

* 10 scales found containing the notes A#, F, A, B, Eb, G.

Acoustic & Digital Analysis

Digital footprint of the F9b5/A# chord for MIDI programming and synthesizer sound design.

MIDI Numbers 70, 65, 69, 71, 63, 67

Frequencies (Hz)

466.1637615180899, 349.2282314330039, 440, 493.8833012561241, 311.1269837220809, 391.99543598174927