Build the sound
Play B – D – F – A♭ individually, then choose a shell voicing above. Sing the highest note before playing the chord.
Voicings · B°7 · Guitar
B°7 voicings on guitar
B°7 is spelled B – D – F – A♭ (1 ♭3 ♭5 𝄫7) — passing chords between diatonic chords, and as a 7♭9 without its root. Here are 3 ways to voice it on guitar: drop 2, drop 3, shell. Every diagram is playable — press play to hear the chord, or “roll it” to hear the voices one by one, low to high.
The voicings
3 ways to play B°7.
SoundRoot in gold, other voices in teal. Tap any note.
Drop 2
F · B · D · A♭Take the close voicing and drop its second-highest voice an octave. The most-used four-note voicing on guitar and in piano left hands. Strings D-G-B-e, frets 3-4-3-4.
Drop 3
D · B · F · A♭Drop the third-highest voice of the close voicing an octave: a wide, open sound. Strings A-G-B-e, frets 5-4-6-4 (position 2).
Shell (1–7–3)
B · A♭ · DRoot, seventh and third only. The fifth is dropped — it adds nothing to the chord's identity — leaving a light, clear voicing. Strings A-G-B, frets 2-1-3.
Your next 10 minutes
Make B Diminished 7th part of your playing
Change the top note
Compare the displayed voicings of B°7. Notice which note is highest in each. Repeat the two shapes with the smallest comfortable hand movement, leaving a beat of silence between them.
Comp with space
Play B°7 on beats 2 and 4 at 60 bpm for four bars, then on the “and” of beat 2 for four bars. Keep the same notes while changing the rhythm. Mute unused strings and test each fretted note for buzz.
Listen for this: The chord tones are B, D, F, A♭. passing chords between diatonic chords, and as a 7♭9 without its root. A fuller voicing is not automatically better: leave room for the melody and bass.
Understand the sound
B°7: from a pattern to a musical choice
What gives B°7 its identity?
Successive chord tones are separated by minor thirds. The seventh is a diminished seventh, not a major sixth in the chord’s theoretical spelling, even when they share a piano key.
Here the third is D, and degree 𝄫7 is A♭. Play B in the bass and compare these voices individually before combining them.
Choose a useful voicing
Start with the smallest displayed shape you can play cleanly. Move its highest note into a comfortable register and listen for a clear melody above the chord.
Sound the strings separately before playing them together. If a note is muted, adjust the finger angle instead of squeezing harder.
Your guitar checkpoint
Start with B on string 6, fret 7. The next note D is on string 6, fret 10. Name both notes aloud before playing, then find the same two pitches in another octave.
Before moving on, close the diagram and name the notes: B · D · F · A♭. Then play a two-bar phrase from memory and leave two bars of silence.
Behind the voicings
Every B°7 chord tone on the fretboard.
Reference
B°7 — chord tones & function.
| Chord tone | Note | Interval |
|---|---|---|
| 1 | B | unison |
| ♭3 | D | minor 3rd |
| ♭5 | F | diminished 5th |
| 𝄫7 | A♭ | diminished 7th |
Arpeggio: B°7 arpeggio on guitar. Scale: B Diminished (whole–half).
Take it to the bandstand.Practice Radio streams endless changes to comp B°7 through all twelve keys, with the chord and scale shown live — plus ear-training and call & response modes.
▶ Open Practice RadioCommon questions
B°7 voicings FAQ.
What notes are in B°7?
B, D, F, A♭ — chord tones 1 ♭3 ♭5 𝄫7.
What is the easiest B°7 voicing on guitar?
The shell voicing (root, seventh, third) on strings A, G, B: three notes, one comfortable shape, and it still sounds unmistakably like B°7.
What is a drop-2 voicing?
Start from the close voicing B D F A♭ and drop the second note from the top an octave: F – B – D – A♭. It spreads the chord so it fits the hand — and on guitar it fits four adjacent strings.
Where does B°7 appear?
B°7 is passing chords between diatonic chords, and as a 7♭9 without its root. Its character is symmetrical, restless.
Keep going
Diminished 7th voicings in every other key.
Same chord on piano · Diminished 7th hub.
Other chords from B