Quick Answer & Harmonic Definition

To play the C Dominant 7th chord on piano, press the keys C, E, G, A# simultaneously. In root position, C is the lowest note. First inversion places E in the bass; second inversion uses G as the lowest note.

Piano Chord

C7 Piano Chord

A major triad with a minor seventh. Creates harmonic tension that resolves to the tonic. Learn the C Dominant 7th chord on piano with interactive keyboard, inversions, and audio playback.

Notes
C – E – G – A#
Intervals
0 – 4 – 7 – 10
Type
seventh chord
C E G A#
E
A
D
G
B
e
3
5
7
9
12
4 notes · Standard (E A D G B E)

Playing the C7 Piano Chord

The C7 chord is a dominant 7th chord built on the root C. It contains 4 notes: C, E, G, A#. On piano, this chord is played by pressing these keys simultaneously or as an arpeggio.

A major triad with a minor seventh. Creates harmonic tension that resolves to the tonic. Mastering the C7 chord opens up countless songs and progressions in the key of C.

Piano Finger Positions for C7

For the C7 seventh chord, use these finger positions:

  • Right hand (root position): Thumb (1) on C, middle finger (3) on E, pinky (5) on G.
  • Left hand (root position): Pinky (5) on C, middle finger (3) on E, thumb (1) on G.
  • Arpeggiated: Play the notes sequentially from lowest to highest for a broken seventh effect.

C7 Chord Inversions

Inversions change the bass note while keeping the same harmonic quality:

Inversion Bass Note Notes (bottom to top) Sound
Root C C – E – G – A# Most stable
1st E E – G – A# – C Lighter, less stable
2nd G G – A# – C – E Open, airy

Interval Structure of C7

Degree Interval Semitones Note in C
Root Root (R) 0 C
3rd Major 3rd 4 E
5th Perfect 5th 7 G
7th Minor 7th 10 A#

Common Progressions with C7 on Piano

  • I–IV–V–I: C7 – F7 – G7 – C7 (classic cadence)
  • I–V–vi–IV: C7 – G – Am – F (pop progression)
  • ii–V–I: Dm – G – C7 (jazz turnaround)

Other C Piano Chords

C
Major
Cm
Minor
Cmaj7
Major 7th
Cm7
Minor 7th
Cdim
Diminished
Caug
Augmented

Dominant-Septakkord Chord in All 12 Keys

C7 C#7 D7 D#7 E7 F7 F#7 G7 G#7 A7 A#7 B7
Virtual Piano
Interactive keyboard
C7 Guitar
Guitar chord shapes
C Scale
Notes that fit this chord
Songs
Find songs using C7

Knowledge Base & FAQs

C7 Piano Chord — FAQ

Everything you need to know about our browser-based Web Audio engine, instruments, and music theory workspace.

How do I play the C7 chord on piano?

To play the C Dominant 7th chord on piano, press the keys C, E, G, A# simultaneously.

In root position, C is the lowest note. First inversion places E in the bass; second inversion uses G as the lowest note.

What are the notes in the C7 piano chord?

The C Dominant 7th piano chord contains 4 notes: C, E, G, A#.

These are derived from the dominant 7th interval formula applied to the root note C.

What is the best fingering for C7 on piano?

For the C7 seventh in root position, use fingers 1 (thumb), 3, and 5 for a triad, or 1, 2, 3, and 5 for a seventh chord.

Inversions may use 1, 2, 4 (first inversion) or 1, 3, 5 (second inversion).

What does the C7 chord sound like?

The C7 chord has a a major triad with a minor seventh.

creates harmonic tension that resolves to the tonic. It provides rich harmonic tension and expressive color within songwriting and jazz arrangements.

What keys does the C7 chord belong to?

C7 appears frequently across modal, jazz, blues, and contemporary progressions as an essential tension or resolution voicing.

What are the inversions of C7 on piano?

C7 has 3 inversions.

Root position: C–E–G–A#. First inversion: E–G–A#–C. Second inversion: G–A#–C–E.

What chords go well with C7 on piano?

In the key of C major, C7 pairs naturally with F major (IV chord), G major (V chord), and Am (vi chord).

The I–IV–V–I progression is a classic way to practice these.

Is C7 a good chord for beginners on piano?

C7 has 4 notes, which may be challenging for beginners.

Start with the basic triad (root, third, fifth) before adding the full seventh extension.

How do I use C7 in a chord progression?

C7 functions as the tonic (I) in C major.

A classic progression is I–IV–V–I: C7–F–G–C7. Practice this in both hands separately before combining.

What is the difference between C major and C minor on piano?

The C major chord (C–E–G) uses a major third (4 semitones from root) for a bright sound.

The Cm chord uses a minor third (3 semitones) for a darker, more emotional sound.