C#m7b5 chord (C sharp half-diminished seventh) on guitar
C#m7b5 (C sharp half-diminished seventh) has four notes: C sharp, E, G and B. Its formula is 1, b3, b5, b7. In major keys, C#m7b5 is the viiø7 chord in D major.
C#m7b5 chord shapes
Fingers: 3 on A, 1 on D.
Finger 1 barres fret 2, then 3 on A, 4 on G, 2 on e.
Fingers: 1 on A, 3 on D, 2 on G, 4 on B.
Fingers: 1 on A, 3 on D, 2 on G.
Finger 1 barres fret 7, then 3 on E, 4 on D, 4 on G, 2 on B.
Fingers: 3 on E, 1 on A, 4 on D.
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| Symbol | C#m7b5 |
|---|---|
| Also written | C#ø, C#ø7, C#min7b5, C#-7b5 |
| Notes | C# E G B |
| Formula | 1 b3 b5 b7 |
| Intervals | root, minor third, tritone, minor seventh |
| Type | Half-diminished seventh chord |
C#m7b5 across the neck
Guitar · 6-string, tuned low to high: E, A, D, G, B, e. 24 frets.
- E string: fret 0 E (flat 3), fret 3 G (flat 5), fret 7 B (flat 7), fret 9 C# (1), fret 12 E (flat 3), fret 15 G (flat 5), fret 19 B (flat 7), fret 21 C# (1), fret 24 E (flat 3).
- A string: fret 2 B (flat 7), fret 4 C# (1), fret 7 E (flat 3), fret 10 G (flat 5), fret 14 B (flat 7), fret 16 C# (1), fret 19 E (flat 3), fret 22 G (flat 5).
- D string: fret 2 E (flat 3), fret 5 G (flat 5), fret 9 B (flat 7), fret 11 C# (1), fret 14 E (flat 3), fret 17 G (flat 5), fret 21 B (flat 7), fret 23 C# (1).
- G string: fret 0 G (flat 5), fret 4 B (flat 7), fret 6 C# (1), fret 9 E (flat 3), fret 12 G (flat 5), fret 16 B (flat 7), fret 18 C# (1), fret 21 E (flat 3), fret 24 G (flat 5).
- B string: fret 0 B (flat 7), fret 2 C# (1), fret 5 E (flat 3), fret 8 G (flat 5), fret 12 B (flat 7), fret 14 C# (1), fret 17 E (flat 3), fret 20 G (flat 5), fret 24 B (flat 7).
- e string: fret 0 E (flat 3), fret 3 G (flat 5), fret 7 B (flat 7), fret 9 C# (1), fret 12 E (flat 3), fret 15 G (flat 5), fret 19 B (flat 7), fret 21 C# (1), fret 24 E (flat 3).
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Questions
What notes are in the C#m7b5 chord?
C#m7b5 (C sharp half-diminished seventh) has four notes: C sharp, E, G and B. Its formula is 1, b3, b5, b7. C# is the root, E is the minor third, G is the tritone and B is the minor seventh.
How do you play C#m7b5 on guitar?
The easiest shape is x42000. Fingers: 3 on A, 1 on D.
What key is C#m7b5 in?
In major keys, C#m7b5 is the viiø7 chord in D major. It is diatonic to those keys, so it fits songs in any of them.
What is the difference between C#m7b5 and C#dim7?
C#m7b5 and C#dim7 share C#, E and G. C#m7b5 has B, the flat 7th, where C#dim7 has Bb, the double flat 7th.