C dominant seventh chord
C7 chord for piano with keyboard diagram.
Explanation: The C dominant seventh is a four note chord. You can see the four notes of the C seventh chord marked in red color. The chord is often abbreviated as C7.
Theory: The C seventh chord is constructed with a root, a major third, a perfect fifth and a minor seventh.
Fingerings: little finger, middle finger, index finger, thumb (left hand); thumb, index finger, middle finger, little finger (right hand).
Notes: C - E - G - Bb
C7 - inversions
Explanation: The images below show the three inversions of the C dominant seventh chord. C7/E is a C dominant seventh with E as the bass note, C7/G is a C dominant seventh with G as the bass note and C7/Bb is a C dominant seventh with Bb as the bass note. Note that the fifth sometimes are omitted.