How to play Bdim7: a diminished 7th built on B, with 1 voicing, the notes, the keys it belongs to, and songs that use it.
The first diagram is a common voicing: played at the first few frets. An X above a string means don't play it; an O means play it open.
Frets from the low E string to the high E string: x 2 3 1 3 x (x = not played).
| Note | B | D | F | Ab |
|---|---|---|---|---|
| Interval | R | b3 | b5 | bb7 |
Bdim7 is a diminished 7th with B as its root. The full theoretical spelling is B, D, F, Ab. This voicing sounds every chord tone.
Bdim7 is a diatonic chord (built from the key's own notes) in 0 major keys and 4 minor keys. The roman numeral is the chord's place in that key; tap a key for all of its chords.
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Bdim7 is spelled B, D, F, Ab: the root, minor 3rd, flat 5th, double-flat 7th. The common guitar voicing sounds every one of them.
Frets from the low E string to the high E string: x 2 3 1 3 x (x means the string is not played). Fret the G string at the 1st fret. Add the A string at the 2nd fret. Add the D and B strings at the 3rd fret. Strum from the A string down, skipping the high E string; the low E string stays silent.
Bdim7 belongs to 4 keys: F# minor (the iv°, from the harmonic minor), A minor (the ii°, from the harmonic minor), D# minor (the vi°, from the harmonic minor) and C minor (the vii°, from the harmonic minor).
