Bm7b5 Chord on Guitar

Fingerings

How to Practice It

Since Bm7b5 almost never shows up on its own in real playing, learn it inside the full Bm7b5 to E7 to Am cadence from the start. From there, set it against plain Bdim and the symmetrical Bdim7 at the same fret — the three diminished-family chords each swap out just one note from their neighbor, and tracking that single change by ear is worth more than memorizing all three shapes separately.

Common Progressions

• Bm7b5 – E7 – Am (ii – V7 – i in A minor, the classic minor ii-V-i)
• Bm7b5 – E7 – Am7 (the same move with a fuller minor-seventh tonic)
• C#m7b5 – Bm7b5 – Am (a descending half-diminished passage)
• Bm7b5 – E7alt – Am (adding an altered dominant for extra tension)

FAQ

What's the difference between Bm7b5 and Bdim7?

Bm7b5 has a flat seventh (A), while Bdim7 has a diminished seventh (G#); the half-diminished chord is slightly less symmetrical and slightly less harsh than the fully diminished seventh.

Why is Bm7b5 called 'half-diminished'?

It combines the diminished triad with an ordinary flat seventh rather than a fully diminished seventh, so it carries some but not all of a fully diminished chord's tension.

Where does Bm7b5 most commonly appear?

As the ii chord in a minor ii-V-i progression in A minor, leading through E7 into an Am resolution.

Is Bm7b5 the same as Bdim with a note added?

It shares the same diminished triad base as plain Bdim, with a flat seventh layered on top, so in that sense it's Bdim plus one added note, though musically the two serve quite different functions.

Is Bm7b5 difficult to finger?

It's a moderately compact barre shape, generally comparable in demand to other four-note extended chords at the seventh fret.

Why does Bm7b5 sound less common in pop and rock guitar playing?

Its tense, specifically jazz-harmony function doesn't have an obvious equivalent in most pop and rock progressions, which rarely use minor ii-V-i cadences.

How does Bm7b5 relate to Dm6?

Respell B, D, F, A starting from D as a minor sixth chord and nothing changes pitch-wise — it's the same general pattern that links any half-diminished chord to the minor sixth chord sitting a major sixth below it.

Is Bm7b5 ever written with a degree symbol instead?

Yes — some charts use Bø7 (a slashed circle), notation borrowed from classical harmonic analysis that jazz charts adopted for half-diminished chords.

Can Bm7b5 resolve anywhere besides A minor?

Most idiomatically there, but as a secondary ii chord it can briefly set up other minor-key resolutions depending on where the surrounding harmony leads.

Why might Bm7b5 seem harder to hear correctly than Bdim7 at first?

For a beginner, the flat seventh can seem like an unexpected color layered onto an already tense chord, whereas Bdim7's more familiar diminished-seventh sound is easier to place once it's been heard a few times.

Is Bm7b5 something a beginner guitarist typically learns early on?

Rarely early — it's usually introduced once a player starts exploring jazz standards or minor ii-V-i progressions specifically, since it has little use in typical beginner repertoire.

Does the half-diminished chord ever get simplified for easier strumming?

Some players drop the seventh entirely and just play the plain diminished triad instead when a full half-diminished voicing feels like more trouble than a passage is worth, though that does lose some of the chord's intended color.