C♯ half-diminished 7th chord on piano
C♯m7♭5 is a half-diminished 7th chord built on C♯. It uses the notes C♯ - E - G - B and sounds moody and searching; it often leads to a dominant chord. It is also written as D♭ half-diminished 7th.
- Notes
- C♯ E G B
- Formula
- 1 - ♭3 - ♭5 - ♭7
- Right hand fingering
- 1 - 2 - 3 - 5
- Left hand fingering
- 5 - 3 - 2 - 1
- Chord symbol
- C♯m7♭5
How to play C♯m7♭5 step by step
- Find C♯. C♯ is the first black key in each group of two. The same key is also called D♭.
- Add E, 3 half steps above C♯.
- Add G, 6 half steps above C♯.
- Add B, 10 half steps above C♯.
- Press all 4 keys together with fingers 1 - 2 - 3 - 5 of your right hand. Keep your wrist level and let the weight of your arm do the work.
C♯m7♭5 inversions
An inversion uses the same notes in a different order. Inversions let your hand move less between chords, which is how pianists make chord changes sound smooth.
Frequently asked questions
What notes are in the C♯ half-diminished 7th chord?
The C♯ half-diminished 7th chord (C♯m7♭5) contains 4 notes: C♯, E, G, B. Its formula is 1 - ♭3 - ♭5 - ♭7.
How do you play C♯m7♭5 on piano?
Put your right-hand thumb on C♯ and play C♯, E, G, B together using fingers 1 - 2 - 3 - 5. With the left hand, use fingers 5 - 3 - 2 - 1.
Is C♯ half-diminished 7th the same as D♭ half-diminished 7th?
Yes. C♯ half-diminished 7th and D♭ half-diminished 7th use exactly the same piano keys. The name you see depends on the key signature of the piece.