The C dominant seventh chord (abbreviated "C7 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 major chord.

Name
C dominant seventh chord
Synonym
C major-minor seventh chord
Notes
C E G B
Intervals
1 3 5 7
Chord symbol
C7
Type
tetrad (four-note chord)

C7 chord on piano

C7 chord on guitar

C7 chord on ukulele

C7 chord on the staff