C Dominant 7th Chord
Notes
C - E - G - Bb
The C Dominant 7th chord contains 4 notes: C, E, G, Bb. It is built using the following intervals from the root: Root, Major 3rd, Perfect 5th, Minor 7th. On the piano keyboard diagram above, the highlighted keys show exactly which keys you need to press to play this chord.
How Is the C Dominant 7th Chord Built?
A dominant 7th chord combines a major triad with a minor seventh (10 semitones from the root). Formula: Root + Major 3rd + Perfect 5th + Minor 7th. The tension between the major third and the minor seventh (a tritone interval) is what gives this chord its characteristic drive and bluesy feel.
Starting from C, the notes of this chord are: C (the root), E (the Major 3rd), G (the Perfect 5th), Bb (the Minor 7th).
What Key Is the C Dominant 7th Chord In?
Dominant 7th chords serve as the V7 chord in major and minor keys. The V7 has the strongest pull back to the tonic of any chord. For example, G7 is the V7 in C major and naturally resolves to C. This tension-resolution relationship is the foundation of Western harmony.
Fingering
Left Hand
5 - 3 - 2 - 1
Use fingers: Pinky, Middle, Index, Thumb. Place your left hand in a relaxed position and press the corresponding keys simultaneously.
Right Hand
1 - 2 - 3 - 5
Use fingers: Thumb, Index, Middle, Pinky. Keep your right hand curved and relaxed. These fingerings are suggestions — adjust them if you find a more comfortable position for your hand.
For more detailed fingering advice and exercises, check out our complete fingering guide.
Sound Character
The C Dominant 7th chord sounds bluesy, tense, and driving. It creates a strong pull back to the tonic chord. The tritone between the third and seventh is the engine that drives Western harmony forward — it is the tension that makes resolutions satisfying. This is THE chord that defines the blues sound.
Common Uses of the Dominant 7th Chord
Dominant 7th chords are essential in blues (the entire 12-bar blues uses three dominant 7th chords), rock and roll, jazz, and funk. They create energy and forward momentum in a progression. In blues music, all three primary chords (I, IV, V) are typically played as dominant 7ths, giving blues its characteristic sound.
Practice Tips for the C Dominant 7th Chord
Practice the blues turnaround using dominant 7th chords: C7 → F7 → C7 → G7. Also practice resolving dominant 7th chords to their tonic — the tritone between the third and seventh wants to collapse inward, and learning to hear this resolution is key to understanding harmony.
You can also find more exercises and practice ideas on our fingerings guide and chord progressions page.
Frequently Asked Questions
Why does the dominant 7th chord sound bluesy?
The tritone interval between the major third and the minor seventh is the same interval found in the blues scale. This gives dominant 7th chords their characteristic tension and "bluesy" feel. In blues music, all primary chords are played as dominant 7ths.
What is the difference between C7 and Cmaj7?
C7 (dominant 7th) has a minor seventh (Bb) and sounds tense and bluesy. Cmaj7 (major 7th) has a major seventh (B) and sounds warm and dreamy. They serve very different harmonic functions.
Learn More About Piano Chords
If you want to deepen your understanding of the C Dominant 7th chord and piano harmony in general, these guides will help:
- All Piano Chord Types — a complete overview of every chord type with examples
- Piano Keyboard Notes — understand the layout of the keyboard and find any note
- Chord Notation Guide — learn to read chord symbols in sheet music and lead sheets
- Piano Chord Fingerings — proper finger technique for all chord types
- Chord Progressions — how to combine chords into musical sequences
- Chord Inversions — play the C Dominant 7th chord in different positions