Playing the A#dim7 Guitar Chord
The A#dim7 chord is a diminished 7th chord built on the root A#. It contains 4 notes: A#, C#, E, G. On guitar, this chord can be played in multiple positions across the fretboard, from open shapes to barre chord voicings.
Four notes stacked in minor thirds. Extremely tense, used as a passing chord. For guitarists, mastering the A#dim7 chord unlocks many songs in the key of A#.
Recommended A#dim7 Guitar Voicing
The interactive fretboard above shows a practical A#dim7 voicing. The chord notes (A#, C#, E, G) appear as highlighted positions. Tap any highlighted fret to hear that note, or click "Play A#dim7" to hear the full chord.
Interval Structure of A#dim7
| Degree | Interval | Semitones | Note in A# |
|---|---|---|---|
| Root | Root (R) | 0 | A# |
| 3rd | Minor 3rd | 3 | C# |
| 5th | Tritone | 6 | E |
| 7th | Major 6th | 9 | G |
Common Progressions with A#dim7 on Guitar
- I–IV–V: A#dim7 – D#dim7 – Fdim7 (foundation of blues and rock)
- I–V–vi–IV: A#dim7 – F – Gm – D# (modern pop staple)
- I–vi–IV–V: A#dim7 – Gm – D# – F (50s doo-wop)
Tips for Practicing A#dim7 on Guitar
Start by finding the root note A# on the 6th and 5th strings. Build the chord shape from there. Practice transitioning between A#dim7 and nearby chords like D# and F. Use slow, deliberate strums and check each string rings clearly.