C#m7b5 Meio Diminuto Acorde

Diminished triad with a minor seventh. Common in jazz as the ii chord in minor keys.

C#m7b5 Acorde — Quick Answer & Harmonic Definition

The C#m7b5 (Half-Diminished 7th) chord consists of the notes C#, E, G, B. It is constructed from the root note C# using the half-diminished 7th interval formula (0–3–6–10 semitones).

Formula: 0 – 3 – 6 – 10
Notes
C# – E – G – B
Intervals (semitones)
0 – 3 – 6 – 10
Type
7th Chord

C#m7b5 on Piano

Press highlighted keys simultaneously to play the C#m7b5 chord.

R
C# (Root (R))
2
E (Minor 3rd (♭3))
3
G (Tritone (♭5))
4
B (Minor 7th (♭7))

C#m7b5 on Guitar

The C#m7b5 chord uses notes C#, E, G, B. Build a voicing by finding these notes on any strings — root on the 6th string is a common starting point for barre chord shapes.

Interval Analysis

Degree Interval Name Semitones Note in C#
Root Root (R) 0 C#
3rd Minor 3rd (♭3) 3 E
5th Tritone (♭5) 6 G
7th Minor 7th (♭7) 10 B

About the C# Meio Diminuto Chord

The C#m7b5 chord (C# Meio Diminuto) consists of 4 notes: C#, E, G, B. Diminished triad with a minor seventh. Common in jazz as the ii chord in minor keys.

To build any half-diminished 7th chord, apply intervals of 0, 3, 6, 10 semitones above the root. Starting from C#: the notes land on C#, E, G, B.

Playing C#m7b5 on Piano

Press C#, E, G, B simultaneously. In root position, C# is lowest. First inversion places E in the bass for a lighter sound; second inversion uses G as the bass note.

Common Chord Progressions Using C#m7b5

  • I–IV–V: C#m7b5 – F#m7b5 – G#m7b5 (blues and rock)
  • I–V–vi–IV: C#m7b5 – G# – A#m – F# (pop staple)
  • I–vi–IV–V: C#m7b5 – A#m – F# – G# (50s progression)

The C#m7b5 Chord in Context

The C#m7b5 (Meio Diminuto) chord features a distinctive diminished triad with a minor seventh. common in jazz as the ii chord in minor keys. built from the intervals 0–3–6–10. It provides rich harmonic color and tension across pop, jazz, classical, and contemporary compositions.

Other C# Chords

C#
Major
C#m
Minor
C#7
Dominant 7th
C#maj7
Major 7th
C#m7
Minor 7th
C#dim
Diminished

Meio Diminuto Chord in All 12 Keys

Cm7b5 C#m7b5 Dm7b5 D#m7b5 Em7b5 Fm7b5 F#m7b5 Gm7b5 G#m7b5 Am7b5 A#m7b5 Bm7b5
Virtual Piano
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Virtual Guitar
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C# Scale
Notes that fit C#m7b5
Songs
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Knowledge Base & FAQs

C#m7b5 Chord — Frequently Asked Questions

Everything you need to know about our browser-based Web Audio engine, instruments, and music theory workspace.

What notes are in the C#m7b5 chord?

The C# Meio Diminuto chord contains: C#, E, G, B.

These notes are derived by applying the half-diminished 7th interval formula (0–3–6–10 semitones) to the root note C#.

What is the C#m7b5 chord used for?

Diminished triad with a minor seventh.

Common in jazz as the ii chord in minor keys. The C#m7b5 chord is used across pop, rock, jazz, and classical music. As the I chord in the key of C# major, it functions as the most stable resting point in progressions.

How do you play C#m7b5 on piano?

On piano, play C#, E, G, B simultaneously.

In root position, C# is the lowest note. Inversions move the bass note up — first inversion has E lowest, second inversion has G lowest.

How many notes are in a half-diminished 7th chord?

A half-diminished 7th chord has 4 notes: C#, E, G, B (in C#).

It is a 7th chord, extending beyond the basic triad.

What is the difference between C# major and C# minor?

The C# major chord (C#–F–G#) uses a major third (4 semitones), giving it a bright, happy sound.

The C# minor chord (C#–E–G#) uses a minor third (3 semitones), giving it a darker, emotional sound.

What key does C#m7b5 belong to?

C#m7b5 naturally serves as the I chord in the key of C# major.

It also appears as IV in the key of G# major, and as V in the key of F# major.

Can I play C#m7b5 on ukulele?

Yes.

The ukulele uses GCEA tuning with 4 strings. The C#m7b5 chord notes (C#, E, G, B) can be fretted on a ukulele, though the shapes differ from guitar due to the 4-string layout and shorter scale.

What chords go well with C#m7b5?

In the key of C# major, C#m7b5 pairs naturally with F# major (IV), G# major (V), and A#m (vi).

The classic I–IV–V (C#m7b5–F#–G#) is the foundation of blues, country, and rock.

What is a chord inversion of C#m7b5?

An inversion places a non-root note in the bass.

C#m7b5 root position: C# in bass. First inversion: E in bass. Second inversion: G in bass. Inversions create smoother bass line movement without changing the harmony.

How do I memorize the notes in a half-diminished 7th chord?

Remember the formula: 0–3–6–10 semitones from root.

For C#m7b5: start on C#, add 3 semitones, then 6 semitones, then 10 semitones. Practicing this across all 12 roots builds instant recognition of any half-diminished 7th chord.