C#m7b5 (Dbm7b5) Guitar Chord
C#m7b5 (C# half-diminished seventh) is a four-note chord made from C#, E, G and B. A half-diminished chord is a diminished triad with a minor seventh on top. It is the ii chord of a minor key, so it opens the minor ii-V-i that jazz leans on.
C#m7b5 C# half-diminished seventh
Open position1 / 4
Notes
- C#1
- Eb3
- Gb5
- Bb7
Built from the root C#, the minor third E, the flat fifth G and the minor seventh B.
Also written Dbm7b5: Db Fb Abb Cb
How to play C#m7b5
Frets from low E to high E; x means don't play that string.
Easiest shape to start with: Open position (x42000). It has 3 open strings, nothing above fret 4 and 1 muted string.
Keys with C#m7b5
Every note of C#m7b5 is in these keys. The numeral is its place in the key.
Major keys
- viiø7 in D major
Minor keys
- iiø7 in B minor