The C-sharp dominant seventh chord (abbreviated "C#7 chord") is a four-note chord consisting of the notes C♯, E♯, G♯, and B. The chord is formed by adding a minor seventh to a C-sharp major chord.
C-sharp dominant seventh chord
C-sharp major-minor seventh chord
C♯ E♯ G♯ B
1 3 5 ♭7
Tetrad (four-note chord)