The C#7 / Db7 chord (C#7) is made of the notes C#, E#, G# and B. It is built from the root C# with a major third, a perfect fifth and a minor seventh.
The dominant seventh chord creates a tension that wants to resolve to the chord a fourth higher; it is everywhere in blues, jazz and rock.
C#7
Notes: C# – E# – G# – B
Guitar — positions on the neck
Piano — root position and inversions
Fingerings and positions
On guitar, this chord can be played in 4 ways along the neck. It is most often played with a barre. Example fingering (from the low E string to the high E string, x = muted string): x46464. On piano, the right hand plays 4 notes, in root position or in an inversion.
Notes and intervals
Note
Interval
C#
root
E#
major third
G#
perfect fifth
B
minor seventh
In which keys? The C#7 chord is the V7 of F# major and the VII7 of Eb minor.
The notes of the C#7 chord (C#7) are C#, E#, G# and B.
How do you play the C#7 chord on guitar?
On guitar, this chord can be played in 4 ways along the neck. It is most often played with a barre. Example fingering (from the low E string to the high E string, x = muted string): x46464.
How is the C#7 chord built?
The C#7 / Db7 chord (C#7) is made of the notes C#, E#, G# and B. It is built from the root C# with a major third, a perfect fifth and a minor seventh.
Are C# and Db the same chord?
Yes: C# and Db are the same note (they are called enharmonic), so C#7 / Db7 is played exactly the same way, with the same fingerings.