Article
Basic Music Theory for Guitar: What You Actually Need
The essential music theory every guitarist should know - notes, intervals, scales, keys, and chord construction. No fluff, just practical theory you'll use.
F♯ diminished guitar shapes
Popular fretboard positions with fingering suggestions
Showing 8 of 34 playable shapes
About the chord
F♯ diminished guitar chord
F♯o is the F♯ diminished guitar chord. It uses the notes F♯, A, and C and the interval formula 1-♭3-♭5.
The F♯ diminished diminished chord is built from minor thirds, including a diminished fifth C, producing a tense, unstable sound. This dissonant, unresolved tension is commonly used for dramatic transitions, suspenseful moments, or eerie atmospheres in classical, jazz, and film music.
Also written as F♯dim and F♯m♭5.
Root note: F♯
Quality: diminished
Chord tones: 3
Playable shapes: 34
Chord tones
F♯AC
Common guitar voicings
These are quick-start shapes for players who want the answer first and the deeper theory second.
Shape 1
xx4212
- 1 Place the 1st finger on the 1st fret of the 2nd string.
- 2 Place the 2nd finger on the 2nd fret of the 3rd string.
- 3 Place the 3rd finger on the 2nd fret of the 1st string.
- 4 Place the 4th finger on the 4th fret of the 4th string.
- 5 Strum from the 4th string down.
Shape 2
xx4575
- 1 Place the 1st finger on the 4th fret of the 4th string.
- 2 Place the 2nd finger on the 5th fret of the 3rd string.
- 3 Place the 3rd finger on the 5th fret of the 1st string.
- 4 Place the 4th finger on the 7th fret of the 2nd string.
- 5 Strum from the 4th string down.
Notes & Intervals
Each note below shows how the chord is built from its root. This is the theory layer underneath the fretboard shapes.
F♯ Unison (Root) 1
The root anchors the chord and defines its tonal center.
A Minor Third ♭3
This note supplies the minor color and gives the chord its darker emotional pull.
C Diminished Fifth ♭5
The flattened fifth adds tension and a restless, unstable edge.
Quick answers
What notes are in F♯o?
F♯o uses the notes F♯, A, and C. Its interval formula is 1-♭3-♭5.
What is another name for F♯o?
F♯o is also written as F♯dim and F♯m♭5.
How do you play F♯o on guitar?
Place the 1st finger on the 1st fret of the 2nd string. Place the 2nd finger on the 2nd fret of the 3rd string. Place the 3rd finger on the 2nd fret of the 1st string. Place the 4th finger on the 4th fret of the 4th string. Strum from the 4th string down.
Related Articles
Articles that reference this chord and explain how to use it in your playing.
Article
How to Transition from Beginner to Intermediate Guitar Player
A practical roadmap for beginner guitarists ready to level up. Learn the key skills, practice shifts, and mindset changes that bridge the gap to intermediate guitar playing.
Article
Guitar Chord Families: Which Chords Go Together in Every Key
Understand chord families and the I-ii-iii-IV-V-vi-vii pattern that appears in every key. Learn the common chord families for C, G, D, A, E, and F major, and how this knowledge connects to the Nashville Number System.
Article
How to Build Chord Progressions From a Melody on Guitar
Learn to harmonize any melody by building chord progressions underneath. Discover chord tones, non-chord tones, and step-by-step techniques for songwriting.
Article
Guitar Chord Progressions in the Key of G: A Complete Guide
Master chord progressions in the key of G with open voicings, diatonic harmony, and popular song applications
Article
Circle of Fifths for Guitar: The Cheat Code to Music Theory
Understand the circle of fifths and how to use it on guitar. Learn key signatures, chord families, transposing, and why it's the most useful theory tool.
