C#m7b5 chord (C sharp half-diminished seventh) on piano
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 inversions and fingering
C# E G B · RH 1-2-3-5 · LH 5-3-2-1
E G B C# · RH 1-2-4-5 · LH 5-3-2-1
G B C# E · RH 1-2-3-5 · LH 5-3-2-1
B C# E G · RH 1-2-3-5 · LH 5-4-2-1
C# E B · LH 5-3-1
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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 keyboard
Piano, C3 to C5. Notes in this scale, low to high: C#3 (1), E3 (flat 3), G3 (flat 5), B3 (flat 7), C#4 (1), E4 (flat 3), G4 (flat 5), B4 (flat 7).
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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 piano?
Play C#, E, G and B together. Root position: C# E G B · RH 1-2-3-5 · LH 5-3-2-1.
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.